JPH03158132A - Photographic method for inverted and recovered picture - Google Patents
Photographic method for inverted and recovered pictureInfo
- Publication number
- JPH03158132A JPH03158132A JP1297352A JP29735289A JPH03158132A JP H03158132 A JPH03158132 A JP H03158132A JP 1297352 A JP1297352 A JP 1297352A JP 29735289 A JP29735289 A JP 29735289A JP H03158132 A JPH03158132 A JP H03158132A
- Authority
- JP
- Japan
- Prior art keywords
- time
- magnetic field
- images
- waiting
- longitudinal relaxation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title abstract 3
- 238000003384 imaging method Methods 0.000 claims description 11
- 238000005481 NMR spectroscopy Methods 0.000 claims description 3
- 238000002075 inversion recovery Methods 0.000 claims description 3
- 230000003068 static effect Effects 0.000 claims description 2
- 238000007796 conventional method Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000002595 magnetic resonance imaging Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012937 correction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は磁気共鳴イメージング装置の反転回復画像撮影
法（以下工Ｒ画像撮影法）に関し、特に撮影可能画像数
を増加させる撮影法に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an inversion recovery imaging method (hereinafter referred to as an R imaging method) for a magnetic resonance imaging apparatus, and particularly to an imaging method that increases the number of images that can be taken.
ＩＲ画像撮影では被検体に緩和現象を生じさせるための
高周波磁場印加から信号検出のための高周波印加までの
間に反転時間と呼ばれる待時間がある。従来技術では、
この待時間の間にある時間間隔で、複数のスライス用傾
斜磁場と周波数帯域の異なる高周波磁場を印加し、複数
のスライス面に縦緩和現象を生じさせ、各スライス面に
対し、励起後、反転時間経過後に信号検出のための高周
波磁場を印加し信号を検出した。これを繰返し時間と呼
ばれる、ある一定時間間隔で繰返じた。In IR imaging, there is a waiting time called an inversion time between the application of a high-frequency magnetic field to cause a relaxation phenomenon in a subject and the application of a high-frequency magnetic field to detect a signal. In the conventional technology,
At certain time intervals during this waiting time, multiple slicing gradient magnetic fields and high-frequency magnetic fields with different frequency bands are applied to produce a longitudinal relaxation phenomenon on multiple slice planes, and each slice plane is inverted after excitation. After a period of time, a high-frequency magnetic field was applied to detect the signal, and the signal was detected. This was repeated at a certain time interval called the repetition time.
前記従来技術は反転時間で生じる待時間を利用して複数
の画像を撮影しているが、繰返し時間が長い場合、全ス
ライスの信号を計測後、再び待時間が生じることがある
。従来技術ではこの待時間を利用して、他のスライス面
の撮影をすることはしていない。In the conventional technique, a plurality of images are taken using the waiting time caused by the inversion time, but if the repetition time is long, the waiting time may occur again after measuring the signals of all slices. In the prior art, this waiting time is not used to image other slice planes.
本発明は、従来の反転時間によって生じる待時間に加え
、長い繰返し時間によって生じる待時間をも利用して、
撮影可能画像数を増加させることを目的とする。The present invention utilizes the waiting time caused by the long repetition time in addition to the waiting time caused by the conventional reversal time.
The purpose is to increase the number of images that can be taken.
前記目的を達成するために、従来ＩＲ複数画像撮影法で
全スライスの信号計測後に生じる待時間の間に別のスラ
イス面を撮影する従来撮影法を複数組込むことをしたも
のである。In order to achieve the above object, a plurality of conventional imaging methods are incorporated in which another slice surface is imaged during the waiting time that occurs after signal measurement of all slices in the conventional IR multiple image imaging method.
前記手段により、待時間が最大限に利用され、ＩＲ撮影
画像数を増加させることができる。By the means described above, the waiting time can be utilized to the maximum and the number of IR images can be increased.
本発明の実施例を第１図〜第４図により説明する。 Embodiments of the present invention will be described with reference to FIGS. 1 to 4.
第１図に本発明が適用される磁気共鳴イメージング装置
を示す。均一な静磁場を発生する磁石１０１中に、被検
体１０２を置きミ被検体中のＩＨに対して、核磁気共鳴
を生じさせるに必要な高周波を送受信システム１０６に
おいて発生させ、該高周波を送信コイル１０４より、前
記被検体ユ０２に対して照射する。一定時間照射後、被
検体中の１Ｈが発する核磁気共鳴信号を受信コイル１０
５によって検出し、検出された共鳴信号は、前記送受信
システム１０６によって可聴周波数に変換され、更にＡ
／Ｄ変換器１０７によってディジタル信号となる。該信
号は計算機１０９によって必要な処理をなされ、得られ
た画像を表示袋−１１０に表示する。また、イメージン
グに必要な位置情報を信号に付加するための傾斜磁場は
、あらかじめ決められた必要な条件を満足するように計
算機１０９によって制御された傾斜磁場電源１０８と該
電源に接続された傾斜磁場コイル１０３によって印加さ
れる。また、前記送受信システム１０６も同様に計算機
によって制御される。FIG. 1 shows a magnetic resonance imaging apparatus to which the present invention is applied. A subject 102 is placed in a magnet 101 that generates a uniform static magnetic field, and a transmitting/receiving system 106 generates a high frequency necessary to cause nuclear magnetic resonance to the IH in the subject, and the high frequency is transmitted to a transmitting coil. From step 104, the subject 02 is irradiated. After irradiation for a certain period of time, the receiving coil 10 receives nuclear magnetic resonance signals emitted by 1H in the subject.
5, the detected resonance signal is converted to an audio frequency by the transceiver system 106, and further
/D converter 107 converts the signal into a digital signal. The signal is subjected to necessary processing by a computer 109, and the resulting image is displayed on a display bag 110. Further, a gradient magnetic field for adding positional information necessary for imaging to a signal is generated by a gradient magnetic field power supply 108 that is controlled by a computer 109 so as to satisfy predetermined necessary conditions, and a gradient magnetic field connected to the power supply. Applied by coil 103. Further, the transmission/reception system 106 is similarly controlled by a computer.
第２図に一般的な２次元のＩＲ画像撮影シーケンスを示
す、被検体に対し、スライス面選択のため、スライス傾
斜磁場２０４とある周波数帯域を持った１８０″′パル
ス２０１を印加し、あるスライス面のＩＨ原子核に縦緩
和現象を生じさせる。FIG. 2 shows a general two-dimensional IR image capturing sequence. To select a slice plane, a slice gradient magnetic field 204 and a 180'' pulse 201 having a certain frequency band are applied to a subject, and a certain slice A longitudinal relaxation phenomenon is caused in the IH nuclei of the plane.
その後１反転時間Ｔｉ経過後、上記と同じスライス面を
同定するためのスライス傾斜磁場２０Ｓ。After one inversion time Ti has passed, a slice gradient magnetic field 20S is applied to identify the same slice plane as above.
２０６と、信号検出のための２０１と同じ周波数帯例を
持つ９０″パルス２０２及び１８０’パルス２０３を印
加して、発生するエコー信号２１１を２１０に示すタイ
ミングでサンプリングする。206, a 90'' pulse 202 and a 180' pulse 203 having the same frequency band example as 201 for signal detection are applied, and the generated echo signal 211 is sampled at the timing shown at 210.
その際、１次元方向の位置情報を与えるために周波数エ
ンコード傾斜磁場２０９及び、その位相補正用傾斜磁場
２０８を印加する。また、もう１次元方向の位置情報を
与えるため、位相エンコード傾斜磁場２０７を毎回変化
させて、繰返し時間Ｔｒで第２図のシーケンスを繰返し
、信号を計測し、２次元フーリエ変換を行い、画像を得
る。At this time, a frequency encoding gradient magnetic field 209 and a phase correction gradient magnetic field 208 are applied to provide position information in one-dimensional direction. In addition, in order to provide position information in another one-dimensional direction, the phase encode gradient magnetic field 207 is changed each time, the sequence shown in Fig. 2 is repeated for a repetition time Tr, the signal is measured, two-dimensional Fourier transform is performed, and the image is obtain.
次に、従来技術を第３図に示す。従来、ＩＲ両画像複数
撮影するときは、Ｔｉの待時間の間に、ある間隔で２０
１とは異なる周波数帯域を持つ、複数の１８０＠パルス
３０１．３０４を印加し、別のスライス面の１Ｈ原子核
に縦緩和現象を発生させ、それぞれの１８ｏ°パルス２
０１，３０１゜３０４の印加により、Ｔλ時間後に１８
０６パルス２０２，２０３，３０２，３０３，３０５゜
３０６を印加し、そのスライス面より発生するエコー信
号を計測していた。傾斜磁場の印加に関しては全て第２
図と同じ。Next, the prior art is shown in FIG. Conventionally, when taking multiple IR images, 20
A plurality of 180@ pulses 301 and 304 having a frequency band different from 1 are applied to generate a longitudinal relaxation phenomenon in 1H nuclei in another slice plane, and each 18o pulse 2
By applying 01,301°304, 18
06 pulses 202, 203, 302, 303, 305° 306 were applied, and echo signals generated from the slice plane were measured. Regarding the application of gradient magnetic fields, all
Same as figure.
次に本発明を第４図に示す。Ｔｒの待時間が長い場合に
は、工Ｒ複数画像撮影シーケンス４０１終了後にも待時
間が発生する。本発明はこの待時間に撮影が可能な場合
、ここに再び工Ｒ複数画像撮影シーケンス４０２を組込
むことである。このことにより、撮影可能画像数を増や
すことができる。Next, the present invention is shown in FIG. If the waiting time of the Tr is long, the waiting time will occur even after the R multiple image capturing sequence 401 ends. The present invention is to incorporate the multiple image capturing sequence 402 again here if photography is possible during this waiting time. This makes it possible to increase the number of images that can be taken.
本発明により、ＩＲ画像撮影法における撮影可能画像数
を増加させることができる。According to the present invention, it is possible to increase the number of images that can be captured using the IR imaging method.
第１図は磁気共鳴イメージング装置構成図、第２図はＩ
Ｒ画像撮影シーケンスを示す図、第３図は従来のＩＲ複
数画像撮影シーケンスを示す図、第４図は本発明のＩＲ
複数画像撮影シーケンスを示す図である。
１０１・・・磁石、１０２・・・被検体、１０３・−・
傾斜磁場コイル、１０４・・・送信コイル、１ｏ５・・
・受信コイル、１０６・・・送受信システム、１０７・
・・Ａ／Ｄ変換器、１０８・・・傾斜磁場電源、１０９
・・・計算機、第２ 図Figure 1 is a configuration diagram of the magnetic resonance imaging device, Figure 2 is the I
FIG. 3 is a diagram showing a conventional IR multiple image capturing sequence, and FIG. 4 is a diagram showing an IR image capturing sequence of the present invention.
FIG. 3 is a diagram showing a multiple image capturing sequence. 101... Magnet, 102... Subject, 103...
Gradient magnetic field coil, 104... Transmission coil, 1o5...
・Reception coil, 106... Transmission/reception system, 107・
...A/D converter, 108... Gradient magnetic field power supply, 109
...Calculator, Figure 2
Claims (1)
るための高周波磁場を印加し、反転時間と称する、ある
一定時間経過後、縦緩和の状態を観測するために、再び
高周波磁場を印加し、被検体より発する核磁気共鳴信号
に傾斜磁場により位置情報を与えて、検出する反転回復
画像撮影法において、反転時間の待時間に複数のスライ
ス面に縦緩和現象を発生させ、それぞれの縦緩和の発生
から反転時間経過後、同一スライス面の信号を計測する
複数画像撮影法を繰返し時間内に複数回繰返すことを特
徴とする反転回復画像撮影法。1. A high-frequency magnetic field is applied to the specimen placed in a static magnetic field to cause a longitudinal relaxation phenomenon, and after a certain period of time, called the reversal time, the high-frequency magnetic field is applied again to observe the state of longitudinal relaxation. In the inversion recovery imaging method, which applies positional information to the nuclear magnetic resonance signal emitted from the subject using a gradient magnetic field and detects it, a longitudinal relaxation phenomenon is generated in multiple slice planes during the waiting time of the inversion time, and each An inversion recovery imaging method characterized by repeating a multiple image imaging method for measuring signals on the same slice plane multiple times within a repetition time after an inversion time has elapsed since the occurrence of longitudinal relaxation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1297352A JPH03158132A (en) | 1989-11-17 | 1989-11-17 | Photographic method for inverted and recovered picture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1297352A JPH03158132A (en) | 1989-11-17 | 1989-11-17 | Photographic method for inverted and recovered picture |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03158132A true JPH03158132A (en) | 1991-07-08 |
Family
ID=17845399
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1297352A Pending JPH03158132A (en) | 1989-11-17 | 1989-11-17 | Photographic method for inverted and recovered picture |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03158132A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4628489B1 (en) * | 2010-05-27 | 2011-02-09 | 和代 今野 | Binder with file for storing documents |
-
1989
- 1989-11-17 JP JP1297352A patent/JPH03158132A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4628489B1 (en) * | 2010-05-27 | 2011-02-09 | 和代 今野 | Binder with file for storing documents |
| JP2011245764A (en) * | 2010-05-27 | 2011-12-08 | Kazuyo Konno | Binder with document housing file |
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