Abstract
In a previous paper a portal imaging system was described that used a 200 mm diameter, 12.7 mm thick CsI(Tl) crystal transparent screen coupled with a Nikkor 35 mm f 1.4 lens to an Astromed liquid nitrogen cooled CCD TV camera system. The whole 200 mm circular field of the crystal was imaged at a 0.53 mm pixel size. The geometry of the imaging system was optimized to achieve high spatial resolution in spite of the thickness of the screen. Since the last paper was written, an Angenieux 25 mm f 0.95 Super 16 mm movie camera lens has been purchased which has higher optical quality and slightly better depth of focus than the Nikkor 35 mm f 1.4 lens, but gives a pixel size with the Astromed CCD system of 0.8 mm. The Angenieux lens has been used with the Astromed CCD and the 200 mm diameter CsI(Tl) screen to acquire portal images of human subjects. Images of patients being treated in the prostate region have been acquired. These CsI(Tl) images have been compared with portal images produced using conventional portal film. The CsI(TI) images are of higher quality than the film images and can be acquired at lower dose.
| Original language | English (US) |
|---|---|
| Title of host publication | Proceedings of SPIE - The International Society for Optical Engineering |
| Publisher | Society of Photo-Optical Instrumentation Engineers |
| Pages | 682-693 |
| Number of pages | 12 |
| Volume | 3659 |
| Edition | II |
| State | Published - 1999 |
| Event | Proceedings of the 1999 Medical Imaging - Physics of Medical Imaging - San Diego, CA, USA Duration: Feb 21 1999 → Feb 23 1999 |
Other
| Other | Proceedings of the 1999 Medical Imaging - Physics of Medical Imaging |
|---|---|
| City | San Diego, CA, USA |
| Period | 2/21/99 → 2/23/99 |
ASJC Scopus subject areas
- Electrical and Electronic Engineering
- Condensed Matter Physics