WO2017157491A1 - Computed tomography method and apparatus for carrying out said method - Google Patents

Computed tomography method and apparatus for carrying out said method Download PDF

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Publication number
WO2017157491A1
WO2017157491A1 PCT/EP2016/080077 EP2016080077W WO2017157491A1 WO 2017157491 A1 WO2017157491 A1 WO 2017157491A1 EP 2016080077 W EP2016080077 W EP 2016080077W WO 2017157491 A1 WO2017157491 A1 WO 2017157491A1
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scan
organ
sample
expected
scan line
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German (de)
French (fr)
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Norman Hartmann
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Siemens Aktiengesellschaft
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
    • A61B6/02—Arrangements for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
    • A61B6/03—Computed tomography [CT]
    • A61B6/032—Transmission computed tomography [CT]
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
    • A61B6/48—Diagnostic techniques
    • A61B6/488—Diagnostic techniques involving pre-scan acquisition
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
    • A61B6/54—Control of apparatus or devices for radiation diagnosis
    • A61B6/545—Control of apparatus or devices for radiation diagnosis involving automatic set-up of acquisition parameters
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
    • A61B6/54—Control of apparatus or devices for radiation diagnosis
    • A61B6/542—Control of apparatus or devices for radiation diagnosis involving control of exposure

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  • the invention relates to a computed tomography method and an apparatus for carrying it out, in which the best possible low radiation exposure of the patient is sought by a suitable choice of the scan field.
  • CT computed tomography
  • the object underlying the invention is to provide a computed tomography method and device for its implementation in such a way that the lowest possible radiation exposure and a short cycle time but nevertheless the most accurate possible scan is generated.
  • the invention essentially relates to a computer tomographic method in which the operator first determines an expected approximate scan area in which a first sample scan line in a middle scan line of the expected scan area is scanned and the tissue texture detected by this sample scan line is analyzed as to whether the desired area to be examined is detected by the scan line, starting from the middle scan line of the expected scan area up to a first scan area.
  • a search is made for the first scanning boundary, whereby the tissue texture detected by a respective sample scan line is analyzed as to whether the desired area to be examined is determined by the respective scan area Proscan line is detected in which, in a corresponding manner between the middle scan line and a second boundary of the expected scan area w
  • scan lines for the actual examination are essentially only detected between the two determined organ boundaries.
  • the advantage of the invention is that no pre-scan and no human intervention are required in adjusting the scan area and at the same time a more accurate scan is produced. This avoids errors, reduces the radiation to a minimum, and at the same time dramatically reduces the cycle time per scan.
  • the operator manually sets a position XY of an approximate scan area FE or of the organ ORG or the organ group to be examined.
  • the position XY of the approximate scan area FE is determined by the patient P lying on a scan pad U with a predefined / fixed point, where this point is typically located at the foot, the scan pad U or the patient support with sensors, eg. Pressure or light / laser sensors, equipped, the body size and other body reference points, such as. Head, feet, Buttocks, shoulders, etc., and from this the expected anatomical position of the organ or organs to be examined is used to determine the position of the expected approximate scan area FE.
  • a learning system can optionally be set up in which the position XY and the dimensions of the approximate scan area FE are determined by collecting anonymized anatomical data from other patients in a statistical database and statistically evaluating it.
  • This information can be derived such that z.
  • the pancreas is at a 90% probability in a particular area, ie at a particular location XY and within a certain approximate scan area FE.
  • Such a learning system or statistical database may optionally also be associated with the suspected diagnosis, e.g. Suspected pancreatic cancer are brought together because the organ in question depending on the suspected diagnosis u. U. may be changed in its tissue structure and / or above all in its size.
  • the changed organ size is primarily directly related to the size of the approximate scan area FE, and the typically altered tissue structure can optionally serve for a more accurate image evaluation of the sample scan lines which will be described further below.
  • the size or the dimensions of the approximate scanning area FE are typically selected such that the organ ORG or the organ group to be examined can be reliably detected completely by the scanning system.
  • the scanning system now starts a first sample scan line 1 of the middle scan line 1 of the expected scan area FE, ie in the middle of the axis, which is usually perpendicular to the scan lines, and it will be through this Sample Scan Line 1 detected tissue texture analyzed.
  • sample scan lines generally represent an image evaluation method which is assumed to be known per se. This image evaluation method differentiates corresponding organ tissue from background tissue, for example because of the different density, and is itself not considered to be the subject of the invention.
  • the first sample scan line 1 From the first sample scan line 1, it is determined, for example, on the basis of the tissue density and the dimension, whether or not the desired organ ORG was detected by the first scan. If this is not the case in rare cases, the expected scan area FE must be corrected and redefined. If, on the other hand, the first sample scan line 1 detects the desired organ ORG as expected, then starting from the expected scan area FE and a first boundary line Bl of the expected scan area FE with the aid of further sample scan lines 2. 5, a first order boundary A is searched in accordance with a binary search indicated here by arrows, the distance of the sample scan lines typically being halved until two successive sample scan lines detect both organ tissue. Usually, this is achieved on average after four scans.
  • the scan is performed linearly from A to Z only within an accurate scan area required for diagnosis. If desired, a few additional scan lines can be optionally included outside of the determined organ borders.
  • the scan lines within the organ boundaries A and Z are omitted during the detection of the scan lines for diagnosis which correspond to the original sample scan lines 3 and 5 and for this the previously stored corresponding sample scan lines 3 and 5 related.
  • each part of the examined body area is only once exposed to the radiation.
  • the number of sample scan lines can optionally be further reduced if scan lines for the actual examination are anonymously transferred to a statistical database for the respective patient and thus at the next examination the size or the dimensions of the approximate scan data.
  • Area FE can be selected more precisely or less.

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Medical Informatics (AREA)
  • Radiology & Medical Imaging (AREA)
  • Molecular Biology (AREA)
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  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Optics & Photonics (AREA)
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Abstract

The invention substantially relates to a computed tomography method, in which the operator initially sets an expected approximate scanning area, in which a first sample scanning line is a scanned in a mid-scanning row of the expected scanning area and the tissue texture captured by this sample scanning line is analysed in respect of whether the desired region to be examined is captured by the scanning line, in which the first organ boundary is then searched for with the aid of further sample scanning lines in accordance with a binary search, proceeding from the mid-scanning row of the expected scanning area up to a first limit of the expected scanning area, in which, in a corresponding manner, a further organ boundary is ascertained between the mid-scanning row and a second limit of the expected scanning area and in which, then, scanning lines for the actual examination are substantially only captured between the two ascertained organ boundaries. The advantage of the invention consists of there no longer being any need for a preliminary scan and for human intervention when adjusting the scanning area and, at the same time, of a more accurate scan being produced. This avoids errors, reduces the radiation to a minimum and simultaneously dramatically reduces the cycle time per scan.

Description

Beschreibung description
Computertomographisches Verfahren und Vorrichtung zu dessen Durchführung Computed tomographic method and apparatus for carrying it out
Die Erfindung betrifft ein Computertomographisches Verfahren und eine Vorrichtung zu dessen Durchführung, bei dem/der durch geeignete Wahl des Scan-Feldes eine möglichst geringe Strahlenbelastung des Patienten angestrebt wird. The invention relates to a computed tomography method and an apparatus for carrying it out, in which the best possible low radiation exposure of the patient is sought by a suitable choice of the scan field.
Wenn eine Computertomographie (CT) durchgeführt wird, ist es wichtig die Scan-Fläche genau zu definieren, um die Strahlenbelastung für den Patienten zu minimieren. Der Patient wird üblicherweise unter Verwendung einer einfachen visuellen Kalibrierung, bei der Laserlinien auf den Körper projiziert werden, im CT positioniert. Danach erzeugt das CT-Gerät mit geringer Strahlenbelastung einen Vorab-Scan mit geringer Auflösung, der zur eigentlichen Auswahl der Scan- Fläche dient. Sobald die Scan-Flache definiert ist, erfolgt der tatsächliche Scan-Vorgang durch zeilenweise Abtastung. Normalerweise gibt es hierbei eine Überabtastung, um sicherzustellen, dass wirklich jedes Detail erfasst wird. Der Scan- Vorgang wird ziemlich oft vorzeitig gestoppt, bspw. sobald der Bediener sicher ist, dass das zu untersuchende Organ vollständig erfasst wurde. When computed tomography (CT) is performed, it is important to accurately define the scan area to minimize the patient's radiation exposure. The patient is usually positioned on the CT using a simple visual calibration in which laser lines are projected onto the body. Thereafter, the low dose CT device generates a low resolution pre-scan that is used to actually select the scan area. Once the scan area is defined, the actual scan is done by line-by-line scanning. Usually there is oversampling to make sure that every detail is captured. Quite often, the scan process is prematurely stopped, for example as soon as the operator is sure that the organ to be examined has been completely detected.
Die der Erfindung zu Grunde liegende Aufgabe besteht nun darin, ein Computertomographisches Verfahren und Vorrichtung zu dessen Durchführung derart anzugeben, dass eine möglichst geringe Strahlenbelastung und eine geringe Durchlaufzeit aber trotzdem ein möglichst genauer Scan erzeugt wird. The object underlying the invention is to provide a computed tomography method and device for its implementation in such a way that the lowest possible radiation exposure and a short cycle time but nevertheless the most accurate possible scan is generated.
Diese Aufgabe wird durch die Merkmale des Patentanspruchs 1 erfindungsgemäß gelöst. Die weiteren Ansprüche betreffen bevorzugte Ausgestaltungen des erfindungsgemäßen Verfahrens und eine Vorrichtung zu dessen Durchführung. Die Erfindung betrifft im Wesentlichen ein Computer- tomographisches Verfahren, bei dem zunächst vom Bediener eine erwartete ungefähre Scan-Fläche festgelegt wird, bei dem eine erste Probe-Scan-Linie in einer mittleren Scan-Zeile der er- warteten Scan-Fläche abgetastet und die von dieser Probe- Scan-Linie erfasste Gewebetextur analysiert wird, ob der gewünschte zu untersuchende Bereich durch die Scan-Linie er- fasst wird, bei dem dann ausgehend von der mittleren Scan- Zeile der erwarteten Scan-Fläche bis hin zu einer ersten Be- grenzung der erwarteten Scan-Fläche mit Hilfe von weiteren Probe-Scan-Linien entsprechend einer Binär-Suche eine erste Organgrenze gesucht wird, wobei die durch eine jeweilige Probe-Scan-Linie erfasste Gewebetextur analysiert wird, ob der gewünschte zu untersuchende Bereich durch die jeweilige Pro- be-Scan-Linie erfasst wird, bei dem in entsprechender Weise zwischen der mittleren Scan-Zeile und einer zweiten Begrenzung der erwarteten Scan-Fläche eine weitere Organgrenze ermittelt wird und bei dem dann Scan-Linien für die eigentliche Untersuchung im Wesentlichen nur zwischen den beiden ermit- telten Organgrenzen erfasst werden. This object is achieved by the features of claim 1 according to the invention. The other claims relate to preferred embodiments of the method according to the invention and an apparatus for carrying it out. The invention essentially relates to a computer tomographic method in which the operator first determines an expected approximate scan area in which a first sample scan line in a middle scan line of the expected scan area is scanned and the tissue texture detected by this sample scan line is analyzed as to whether the desired area to be examined is detected by the scan line, starting from the middle scan line of the expected scan area up to a first scan area. With the aid of further sample scan lines corresponding to a binary search, a search is made for the first scanning boundary, whereby the tissue texture detected by a respective sample scan line is analyzed as to whether the desired area to be examined is determined by the respective scan area Proscan line is detected in which, in a corresponding manner between the middle scan line and a second boundary of the expected scan area w In this case, scan lines for the actual examination are essentially only detected between the two determined organ boundaries.
Der Vorteil der Erfindung besteht darin, dass kein Vorab-Scan und kein menschlicher Eingriff beim Einstellen der Scan- Fläche mehr erforderlich sind und gleichzeitig ein genauerer Scan produziert wird. Dies vermeidet Fehler, reduziert die Strahlung auf ein Minimalmaß und reduziert gleichzeitig die Durchlaufzeit pro Scan dramatisch. The advantage of the invention is that no pre-scan and no human intervention are required in adjusting the scan area and at the same time a more accurate scan is produced. This avoids errors, reduces the radiation to a minimum, and at the same time dramatically reduces the cycle time per scan.
Nachfolgend wird die Erfindung anhand von in der Zeichnung dargestellten Ausführungsbeispielen näher erläutert. The invention will be explained in more detail with reference to embodiments shown in the drawing.
Zunächst wird in einem ersten Schritt vom Bediener eine Position XY einer ungefähren Scan-Fläche FE bzw. des zu untersuchenden Organs ORG oder der Organgruppe manuell festgelegt. First, in a first step, the operator manually sets a position XY of an approximate scan area FE or of the organ ORG or the organ group to be examined.
Optional wird die Position XY der ungefähren Scan-Fläche FE dadurch festgelegt, dass der Patient P auf einer Scan- Unterlage U mit einem vordefinierten/festen Punkt liegt, wo- bei sich dieser Punkt typischer Weise am Fußende befindet, die Scan-Unterlage U bzw. die Patientenauflage mit Sensoren, bspw. Druck- oder Licht/Laser-Sensoren, ausgestattet ist, die die Körpergröße und weitere Körperreferenzpunkte, wie bspw. Kopf, Füße, Gesäß, Schultern usw., ermitteln und daraus über die erwartete anatomische Position des zu untersuchenden Organs oder der zu untersuchenden Organe die Position der erwarteten ungefähren Scan-Fläche FE bestimmt wird. Ferner kann optional ein lernendes System aufgebaut werden, bei dem die Position XY und die Abmessungen der ungefähren Scan-Fläche FE dadurch festgelegt werden, dass anonymisierte anatomische Daten auch von anderen Patienten in einer statistischen Datenbasis gesammelt und statistisch ausgewertet wer- den. Hiermit lassen sich Angaben ableiten derart, dass z. B. bei einer 38-jährigen, 165cm großen und 70kg schweren Frau, die Bauchspeicheldrüse mit einer Wahrscheinlichkeit von 90% in einem bestimmten Areal, also an einer bestimmten Position XY und innerhalb einer bestimmten ungefähren Scan- Fläche FE, befindet. Optionally, the position XY of the approximate scan area FE is determined by the patient P lying on a scan pad U with a predefined / fixed point, where this point is typically located at the foot, the scan pad U or the patient support with sensors, eg. Pressure or light / laser sensors, equipped, the body size and other body reference points, such as. Head, feet, Buttocks, shoulders, etc., and from this the expected anatomical position of the organ or organs to be examined is used to determine the position of the expected approximate scan area FE. Furthermore, a learning system can optionally be set up in which the position XY and the dimensions of the approximate scan area FE are determined by collecting anonymized anatomical data from other patients in a statistical database and statistically evaluating it. This information can be derived such that z. For example, in a 38-year-old, 165-cm and 70-kg woman, the pancreas is at a 90% probability in a particular area, ie at a particular location XY and within a certain approximate scan area FE.
Ein solches lernendes System bzw. eine solche statistische Datenbasis kann optional auch mit der vermuteten Diagnose, z.B. Verdacht auf Bauchspeicheldrüsenkrebs zusammengebracht werden, weil das betreffende Organ abhängig von der vermuteten Diagnose u. U. in seiner Gewebestruktur und/oder vor allem auch in seiner Größe verändert sein kann. Die veränderte Organgröße geht hierbei natürlich in erster Linie direkt in die Größe der ungefähren Scan- Fläche FE ein und die typi- scherweise veränderte Gewebestruktur kann optional für eine treffendere Bildauswertung der im Folgenden noch weiter beschriebenen Probe-Scan-Linien dienen. Such a learning system or statistical database may optionally also be associated with the suspected diagnosis, e.g. Suspected pancreatic cancer are brought together because the organ in question depending on the suspected diagnosis u. U. may be changed in its tissue structure and / or above all in its size. Of course, the changed organ size is primarily directly related to the size of the approximate scan area FE, and the typically altered tissue structure can optionally serve for a more accurate image evaluation of the sample scan lines which will be described further below.
Die Größe bzw. die Abmessungen der ungefähren Scan- Fläche FE werden typischerweise so gewählt, dass das zu untersuchende Organ ORG oder die Organgruppe sicher vollständig vom Scan- System erfassbar ist. Das Scan-System startet nun eine erste Probe-Scan-Linie 1 der mittleren Scan-Zeile 1 der erwarteten Scan-Fläche FE, also in der Mitte der Achse, die üblicherweise senkrecht zu den Scan-Linien liegt, und es wird die durch diese Probe-Scan- Linie 1 erfasste Gewebetextur analysiert. Die Analyse derThe size or the dimensions of the approximate scanning area FE are typically selected such that the organ ORG or the organ group to be examined can be reliably detected completely by the scanning system. The scanning system now starts a first sample scan line 1 of the middle scan line 1 of the expected scan area FE, ie in the middle of the axis, which is usually perpendicular to the scan lines, and it will be through this Sample Scan Line 1 detected tissue texture analyzed. The analysis of
Probe-Scan-Linien stellt dabei allgemein ein für sich als bekannt angenommenes Bildauswertungsverfahren dar. Dieses Bildauswertungsverfahren unterscheidet entsprechendes Organgewebe von Hintergrundgewebe, bspw. auf Grund der unterschiedlichen Dichte, und wird selbst nicht als Gegenstand der Erfindung betrachtet . In this case, sample scan lines generally represent an image evaluation method which is assumed to be known per se. This image evaluation method differentiates corresponding organ tissue from background tissue, for example because of the different density, and is itself not considered to be the subject of the invention.
Aus der ersten Probe-Scan-Linie 1 wird, bspw. auf Grund der Gewebedichte und der Abmessung, ermittelt, ob das gewünschte Organ ORG vom ersten Scan erfasst wurde oder nicht. Falls dies in seltenen Fällen einmal nicht der Fall sollte, muss die erwartete Scan-Fläche FE korrigiert und neu festgelegt werden . Wenn hingegen die erste Probe-Scan-Linie 1 das gewünschte Organ ORG erwartungsgemäß erfasst, dann wird ausgehend von der erwarteten Scan-Fläche FE und einer ersten Begrenzungslinie Bl der erwarteten Scan-Fläche FE mit Hilfe von weiteren Probe-Scan-Linien 2 ... 5 entsprechend einer hier durch Pfeile an- gedeuteten Binär-Suche eine erste Organgrenze A gesucht, wobei der Abstand der Probe-Scan-Linien typischer Weise solange halbiert wird, bis zwei aufeinanderfolgende Probe-Scan-Linien beide Organgewebe erfassen. Üblicherweise wird dies im Durchschnitt nach vier Scans erreicht. From the first sample scan line 1, it is determined, for example, on the basis of the tissue density and the dimension, whether or not the desired organ ORG was detected by the first scan. If this is not the case in rare cases, the expected scan area FE must be corrected and redefined. If, on the other hand, the first sample scan line 1 detects the desired organ ORG as expected, then starting from the expected scan area FE and a first boundary line Bl of the expected scan area FE with the aid of further sample scan lines 2. 5, a first order boundary A is searched in accordance with a binary search indicated here by arrows, the distance of the sample scan lines typically being halved until two successive sample scan lines detect both organ tissue. Usually, this is achieved on average after four scans.
Das gleiche Teilverfahren wird nun entsprechend am anderen Ende des Organs durchgeführt und eine weitere Organgrenze Z zwischen der mittleren Scan-Zeile 1 und einer zweiten Begrenzungslinie B2 der erwarteten Scan-Fläche FE ermittelt. The same sub-procedure is now carried out correspondingly at the other end of the organ and determines a further ORZ Z between the middle scan line 1 and a second boundary line B2 of the expected scan area FE.
Sobald Organgrenzen A und Z gefunden sind, wird der Scan- Vorgang linear von A bis Z lediglich innerhalb einer genauen Scan-Fläche durchgeführt, die zur Diagnose erforderlich ist. Falls gewünscht, können optional außerhalb der ermittelten Organgrenzen zusätzlich noch einige weitere Scan-Linien mi- terfasst werden. Once organ boundaries A and Z are found, the scan is performed linearly from A to Z only within an accurate scan area required for diagnosis. If desired, a few additional scan lines can be optionally included outside of the determined organ borders.
Optional werden dabei die Scan-Linien innerhalb der Organgrenzen A und Z während der Erfassung der Scan-Linien zur Diagnose ausgelassen, die den ursprünglichen Probe-Scan-Linien 3 und 5 entsprechen ausgelassen und hierfür die vorher ge- speicherten entsprechenden Probe-Scan-Linien 3 und 5 verwandt. Hierdurch wird jeder Teil des untersuchten Körperbereiches nur exakt einmal der Strahlung ausgesetzt wird. Optionally, the scan lines within the organ boundaries A and Z are omitted during the detection of the scan lines for diagnosis which correspond to the original sample scan lines 3 and 5 and for this the previously stored corresponding sample scan lines 3 and 5 related. As a result, each part of the examined body area is only once exposed to the radiation.
Die Anzahl der Probe-Scan-Linien kann optional weiter ver- kleinert werden, wenn Scan-Linien zur eigentlichen Untersuchung für den jeweiligen Patienten anonymisiert in eine statistische Datenbasis transferiert werden und damit bei der nächsten Untersuchung die Größe bzw. die Abmessungen der ungefähren Scan-Fläche FE genauer bzw. kleiner gewählt werden kann . The number of sample scan lines can optionally be further reduced if scan lines for the actual examination are anonymously transferred to a statistical database for the respective patient and thus at the next examination the size or the dimensions of the approximate scan data. Area FE can be selected more precisely or less.

Claims

Patentansprüche claims
1. Computertomographisches Verfahren, 1. computed tomography method,
a) bei dem zunächst eine erwartete ungefähre Scan-Fläche (FE) festgelegt wird, wobei die Größe bzw. die Abmessungen der ungefähren Scan-Fläche so gewählt wird, dass ein zu untersuchendes Organ (ORG) sicher vollständig vom Scan-System erfassbar ist, a) in which an expected approximate scan area (FE) is initially determined, wherein the size or the dimensions of the approximate scan area is selected such that an organ to be examined (ORG) is reliably completely detectable by the scan system,
b) bei dem eine erste Probe-Scan-Linie (1) in einer mittleren Scan-Zeile der erwarteten Scan-Fläche (FE) abgetastet und die von dieser Probe-Scan-Linie (1) erfasste Gewebetextur analysiert wird, ob das gewünschte zu untersuchende Organ (ORG) durch die Scan-Linie erfasst wird, b) in which a first sample scan line (1) is scanned in a middle scan line of the expected scan area (FE) and the tissue texture detected by this sample scan line (1) is analyzed, whether the desired one examining organ (ORG) is detected by the scan line,
c) bei dem, sofern erste Probe-Scan-Linie (1) das zu untersu- chende Organ (ORG) erfasst wird, dann ausgehend von der mittleren Scan-Zeile (1) der erwarteten Scan-Fläche (FE) bis hin zu einer ersten Begrenzung (Bl) der erwarteten Scan-Fläche (FE) mit Hilfe von weiteren Probe-Scan-Linien (2 ... 5) entsprechend einer Binär-Suche eine erste Organgrenze (A) ge- sucht wird, wobei die durch eine jeweilige Probe-Scan-Linie (2..5) erfasste Gewebetextur analysiert wird, ob das zu untersuchende Organ (ORG) durch die jeweilige Probe-Scan-Linie (2..5) erfasst wird, c) in which, if the first sample scan line (1) the organ to be examined (ORG) is detected, then from the middle scan line (1) of the expected scan area (FE) to a first boundary (B1) of the expected scan area (FE) with the aid of further sample scan lines (2... 5), a first order boundary (A) is searched for in accordance with a binary search Analyzed tissue sample (2..5) determines whether the organ to be examined (ORG) is detected by the respective sample scan line (2..5),
d) bei dem entsprechend Schritt c) zwischen der mittleren Scan-Zeile (1) und einer zweiten Begrenzung (B2) der erwarteten Scan-Fläche (FE) eine weitere Organgrenze (Z) ermittelt wird und d) in which according to step c) between the middle scan line (1) and a second boundary (B2) of the expected scan area (FE), a further organ border (Z) is determined, and
e) bei dem dann Scan-Linien für die eigentliche Untersuchung im Wesentlichen nur zwischen den beiden ermittelten Organ- grenzen (A, Z) erfasst werden. e) in which scan lines for the actual examination are then detected essentially only between the two determined organ boundaries (A, Z).
2. Computertomographisches Verfahren nach Anspruch 1, bei dem mindestens die Probe-Scan-Linien (3, 5), die eine Gewebetextur des zu untersuchende Organs (ORG) enthalten, ge- speichert werden und 2. Computed tomography method according to claim 1, wherein at least the sample scan lines (3, 5) containing a tissue texture of the organ to be examined (ORG) are stored, and
bei dem im Schritt e) entsprechende Scan-Linien für die eigentliche Untersuchung ausgelassen und hierfür die vorher ge- speicherten entsprechenden Probe-Scan-Linien (3,5) eingesetzt werden . in the case of the scan line corresponding to step e) for the actual examination and for this purpose the previously stored corresponding sample scan lines (3.5) can be used.
3. Computertomographisches Verfahren nach Anspruch 1 oder 2, bei dem die Position (XY) der ungefähren Scan-Fläche (FE) dadurch festgelegt wird, dass der Patient (P) auf einer Scan- Unterlage (U) mit einem vordefinierten/festen Punkt liegt, und die Scan-Unterlage (U) mit Sensoren ausgestattet ist, die die Körpergröße und/oder weitere Körperreferenzpunkte ermit- teln und über die relative anatomische Position des zu untersuchenden Organs die Position der erwarteten ungefähren Scan- Fläche (FE) bestimmt wird. 3. Computed tomography method according to claim 1 or 2, wherein the position (XY) of the approximate scan area (FE) is determined by the fact that the patient (P) on a scan pad (U) with a predefined / fixed point and the scan base (U) is equipped with sensors which determine the body size and / or other body reference points and the position of the expected approximate scan area (FE) is determined by the relative anatomical position of the organ to be examined.
4. Computertomographisches Verfahren nach einem der vorherge- henden Ansprüche, bei dem ein lernendes System vorhanden ist mit dessen Hilfe die Position (XY) und Größe der ungefähren Scan-Fläche (FE) dadurch festgelegt werden, dass anonymisierte anatomische Daten auch von anderen Patienten in einer statistischen Datenbasis gesammelt und statistisch ausgewertet werden. 4. Computed tomography method according to one of the preceding claims, in which a learning system is provided by means of which the position (XY) and size of the approximate scan area (FE) are determined by anonymized anatomical data from other patients in a statistical database and statistically evaluated.
5. Computertomographisches Verfahren nach Anspruch 4, bei dem anonymisierte anatomische Daten auch von anderen Patienten in Abhängigkeit der jeweiligen Diagnose gesammelt statistisch ausgewertet werden und die Position (XY) und Größe der ungefähren Scan-Fläche (FE) in Abhängigkeit der vermuteten Diagnose ermittelt wird. 5. Computed tomographic method according to claim 4, wherein the anonymized anatomical data collected statistically from other patients as a function of the respective diagnosis are evaluated and the position (XY) and size of the approximate scan area (FE) depending on the suspected diagnosis is determined.
6. Computertomographisches Verfahren nach Anspruch 5, bei dem die in Abhängigkeit der jeweiligen Diagnose gesammelten anonymisierten anatomischen Daten auch Daten bezüglich der Gewebestruktur der jeweiligen anderen Patienten enthalten und hieraus eine für die Diagnose typische Gewebestruktur ermittelt wird und 6. Computed tomographic method according to claim 5, in which the anonymized anatomical data collected as a function of the respective diagnosis also contain data relating to the tissue structure of the respective other patients and from this a tissue structure typical for the diagnosis is determined, and
bei dem die Analyse der von der jeweiligen Probe-Scan-Linie erfassten Gewebetextur unter Berücksichtigung dieser für die Diagnose typischen Gewebestruktur erfolgt. in which the analysis of the tissue texture detected by the respective sample scan line takes place with consideration of this tissue structure typical for the diagnosis.
7. Vorrichtung zur Durchführung des Computertomographischen Verfahrens nach einem der vorhergehenden Ansprüche, 7. An apparatus for performing the computed tomography method according to any one of the preceding claims,
bei der eine Analyseeinheit derart vorhanden ist, dass die jeweilige Probe-Scan-Linie erfasste Gewebetextur analysiert wird, ob das zu untersuchende Organ (ORG) durch die jeweilige Probe-Scan-Linie erfasst wird, in which an analysis unit is provided in such a way that the tissue texture detected at the respective sample scan line is analyzed, whether the organ to be examined (ORG) is detected by the respective sample scan line,
bei der eine Sucheinheit derart vorhanden ist, dass ausgehend von der mittleren Probe-Scan-Zeile (1) bis hin zu der ersten bzw. zweiten Begrenzung (Bl, B2) der erwarteten Scan-Fläche (FE) mit Hilfe von Probe-Scan-Linien und der Analyseeinheit die erste bzw. die zweite Organgrenze (A,Z) entsprechend einer Binär-Suche gesucht wird, und in which a search unit is present in such a way that starting from the middle sample scan line (1) up to the first or second boundary (B1, B2) of the expected scan area (FE) with the aid of sample scanning Lines and the analysis unit, the first and the second ORANGRENZEN (A, Z) is searched according to a binary search, and
bei der eine Steuereinheit derart vorhanden ist, dass die Scan-Linien für die eigentliche Untersuchung im Wesentlichen nur zwischen den beiden ermittelten Organgrenzen (A, Z) erfasst werden. in which a control unit is present such that the scan lines for the actual examination are detected essentially only between the two determined organ boundaries (A, Z).
PCT/EP2016/080077 2016-03-15 2016-12-07 Computed tomography method and apparatus for carrying out said method WO2017157491A1 (en)

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