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Spatial Resolution Evaluation of the Xtal Cube PET Detector Using Monolithic Scintillator Segmented by Internal Laser Processing
https://repo.qst.go.jp/records/64600
https://repo.qst.go.jp/records/64600159f284e-3b1b-455d-932b-f04a7616a092
| Item type | 会議発表用資料 / Presentation(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2012-06-01 | |||||
| タイトル | ||||||
| タイトル | Spatial Resolution Evaluation of the Xtal Cube PET Detector Using Monolithic Scintillator Segmented by Internal Laser Processing | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_c94f | |||||
| 資源タイプ | conference object | |||||
| アクセス権 | ||||||
| アクセス権 | metadata only access | |||||
| アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
| 著者 |
Yoshida, Eiji
× Yoshida, Eiji× et.al× 吉田 英治 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | The Xtal cube is our new PET detector, which is being developed to achieve isotropic 3D positioning detectability. The Xtal cube is based on a 3D lutetium yttrium oxyorthosilicate (LYSO) block for which all surfaces are covered with arrays of multi pixel photon counters (MPPCs). We have shown that the Xtal cube can achieve isotropic intrinsic resolution with the Anger-type calculation even at the block edges. In this work, we developed a new one pair prototype system to simulate a box-type PET scanner that image over the field-of-view (FOV), and evaluated imaging performance of the Xtal cube. The one pair prototype system consisted of two Xtal cubes, two XY-stages, and a 192-channel data acquisition system. The Xtal cube consisted of the LYSO cubic crystal block of (18 mm)3 in which the 3D grids of 2 mm pitch were fabricated by the internal laser processing. This technique is an internally focused laser processing which carves a groove into a monolithic scintillator block by irradiating a short pulse laser beam. A dense arrangement of multiple micro-cracks works efficiently as a scattering wall for the scintillation photons. 4 x 4 MPPCs were optically coupled to each surface of the 3D LYSO block. The detector positions were automatically controlled to simulate a box-type PET. Distance between each Xtal cube was 25.7 mm. Data were collected for assumed all projection data and then a sinogram was obtained. The data were reconstructed using the filtered back projection. From 22Na uniform irradiation, both Xtal cubes could easily achieve 2 mm3 uniform crystal identification and approximately 10 % in the energy resolution. From the point source measurements, we successfully obtained uniform spatial resolution of 1.7 mm over the FOV. We developed the one pair prototype system for the Xtal cube, and we confirmed its potential for high-resolution imaging. | |||||
| 会議概要（会議名, 開催地, 会期, 主催者等） | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | World Congress on Medical Physics and Biomedical Engineering | |||||
| 発表年月日 | ||||||
| 日付 | 2012-05-31 | |||||
| 日付タイプ | Issued | |||||
