JP5296728B2 - 偏光フリンジ投射による歯牙表面撮像 - Google Patents
偏光フリンジ投射による歯牙表面撮像 Download PDFInfo
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- JP5296728B2 JP5296728B2 JP2010056981A JP2010056981A JP5296728B2 JP 5296728 B2 JP5296728 B2 JP 5296728B2 JP 2010056981 A JP2010056981 A JP 2010056981A JP 2010056981 A JP2010056981 A JP 2010056981A JP 5296728 B2 JP5296728 B2 JP 5296728B2
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Images
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- A61B1/24—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor for the mouth, i.e. stomatoscopes, e.g. with tongue depressors; Instruments for opening or keeping open the mouth
- A61B1/247—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor for the mouth, i.e. stomatoscopes, e.g. with tongue depressors; Instruments for opening or keeping open the mouth with means for viewing areas outside the direct line of sight, e.g. dentists' mirrors
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- Health & Medical Sciences (AREA)
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Description
(a)第2方向が第1方向に対し平行なポジションのことを同一偏光ポジション又は平行偏光ポジションと呼ぶ。図2Aに、検光器28が同一偏光ポジションにあるときの偏光透過軸の向きを示す。検光器28がこのポジションにあるとき検出器30で受光されるのは、歯牙20の表面で生じる鏡面反射光、歯牙20のエナメル層表層部で生じる散乱反射光の大部分、並びに歯牙20の内奥部で生じる散乱反射光の一部分である。このポジションでは、他のポジションに比べコントラストが良好になる。また、
(b)第2方向が第1方向に対し直交するポジションのことを交差偏光ポジション又は直交偏光ポジションと呼ぶ。図2Bに、検光器28が交差偏光ポジションにあるときの偏光透過軸の向きを示す。このポジションを使用した場合、歯牙表面からの鏡面反射光を抑圧し、歯牙内部からの散乱反射光をより多く受光することができる。
Claims (3)
- 350〜500nmの波長域に属する照明光に所定空間周波数のフリンジパターンを付与しフリンジパターン照明光として出射するフリンジパターン発生器と、
そのフリンジパターン照明光が辿る光路上にありその偏光透過軸が第1方向を向いている偏光器と、
その偏光器を経たフリンジパターン照明光を歯牙に入射させる投射レンズと、
その歯牙の表面又は内部で反射又は散乱された光又はその一部を検出光路上に取り込む撮像レンズと、
検出光路上にありその偏光透過軸が第2方向を向いている検光器と、
検出光路及びその上の検光器を経た光を検出する画像データ取得用の検出器と、
フリンジパターン発生器で付与されるフリンジパターンの一部分又は複数部分に亘り前記フリンジパターン照明光の強度を調整する動作を、検出器の出力からもたらされる画像データに基づき、所与の指令乃至指令群に従い実行する制御論理プロセッサと、
を備える口腔内撮像装置。 - 請求項1記載の口腔内撮像装置であって、第1方向と第2方向が互いに平行であり又は直交する口腔内撮像装置。
- 請求項1記載の口腔内撮像装置であって、フリンジパターン発生器が、格子、空間光変調器又はフリンジパターン発光型の光源を有する口腔内撮像装置。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/424,562 | 2009-04-16 | ||
US12/424,562 US20100268069A1 (en) | 2009-04-16 | 2009-04-16 | Dental surface imaging using polarized fringe projection |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2010246899A JP2010246899A (ja) | 2010-11-04 |
JP5296728B2 true JP5296728B2 (ja) | 2013-09-25 |
Family
ID=42270206
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2010056981A Expired - Fee Related JP5296728B2 (ja) | 2009-04-16 | 2010-03-15 | 偏光フリンジ投射による歯牙表面撮像 |
Country Status (6)
Country | Link |
---|---|
US (2) | US20100268069A1 (ja) |
EP (1) | EP2241247B1 (ja) |
JP (1) | JP5296728B2 (ja) |
KR (1) | KR20100114843A (ja) |
CN (1) | CN101862182B (ja) |
ES (1) | ES2386115T3 (ja) |
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CN101862182A (zh) | 2010-10-20 |
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