Laser cone beam computed tomography scanner geometry for large volume 3D dosimetry

被引：10

作者：

Jordan, K. J. ^{[1
]}

Turnbull, D. ^{[1
]}

Batista, J. J. ^{[1
]}

机构：

[1] Univ Western Ontario, London Hlth Sci Ctr, London Reg Canc Program, London, ON, Canada

来源：

7TH INTERNATIONAL CONFERENCE ON 3D RADIATION DOSIMETRY (IC3DDOSE) | 2013年 / 444卷

关键词：

GELS;

D O I：

10.1088/1742-6596/444/1/012062

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A new scanner geometry for fast optical cone-beam computed tomography is reported. The system consists of a low power laser beam, raster scanned, under computer control, through a transparent object in a refractive index matching aquarium. The transmitted beam is scattered from a diffuser screen and detected by a photomultiplier tube. Modest stray light is present in the projection images since only a single ray is present in the object during measurement and there is no imaging optics to introduce further stray light in the form of glare. A scan time of 30 minutes was required for 512 projections with a field of view of 12 x 18 cm. Initial performance from scanning a 15 cm diameter jar with black solutions is presented. Averaged reconstruction coefficients are within 2% along the height of the jar and within the central 85% of diameter, due to the index mismatch of the jar. Agreement with spectrometer measurements was better than 0.5% for a minimum transmission of 4% and within 4% for a dark, 0.1% transmission sample. This geometry's advantages include high dynamic range and low cost of scaling to larger (>15 cm) fields of view.

引用

页数：4