Predictions of a stochastic model of bone marrow cell survival in high dose rate radiation fields with arbitrary neutron to gamma-ray absorbed dose rate ratios

2000 ◽  
Vol 27 (10) ◽  
pp. 2385-2392
Author(s):  
Thomas E. Blue ◽  
Jeffrey E. Woollard
Keyword(s):  
Bone Marrow ◽  
Dose Rate ◽  
Gamma Ray ◽  
Marrow Cell ◽  
Absorbed Dose ◽  
High Dose Rate ◽  
High Dose ◽  
Absorbed Dose Rate ◽  
Radiation Fields ◽  
Rate Ratios

Development of a simultaneous imaging system to measure the optical and gamma ray images of Ir-192 source for high-dose-rate brachytherapy

2021 ◽  
Vol 16 (12) ◽  
pp. T12005
Author(s):  
J. Nagata ◽  
S. Yamamoto ◽  
Y. Noguchi ◽  
T. Nakaya ◽  
K. Okudaira ◽  
...  
Keyword(s):  
Dose Rate ◽  
Spatial Resolution ◽  
Gamma Camera ◽  
Gamma Ray ◽  
Imaging System ◽  
High Dose Rate ◽  
High Dose ◽  
Cmos Camera ◽  
Absolute Position ◽  
The Absolute

Abstract In high-dose-rate (HDR) brachytherapy, verification of the Ir-192 source's position during treatment is needed because such a source is extremely radioactive. One of the methods used to measure the source position is based on imaging the gamma rays from the source, but the absolute position in a patient cannot be confirmed. To confirm the absolute position, it is necessary to acquire an optical image in addition to the gamma ray image at the same time as well as the same position. To simultaneously image the gamma ray and optical images, we developed an imaging system composed of a low-sensitivity, high-resolution gamma camera integrated with a CMOS camera. The gamma camera has a 1-mm-thick cerium-doped yttrium aluminum perovskite (YAIO3: YAP(Ce)) scintillator plate optically coupled to a position-sensitive photomultiplier (PSPMT), and a 0.1-mm-diameter pinhole collimator was mounted in front of the camera to improve spatial resolution and reduce sensitivity. We employed the concept of a periscope by placing two mirrors tilted at 45 degrees facing each other in front of the gamma camera to image the same field of view (FOV) for the gamma camera and the CMOS camera. The spatial resolution of the imaging system without the mirrors at 100 mm from the Ir-192 source was 3.2 mm FWHM, and the sensitivity was 0.283 cps/MBq. There was almost no performance degradation observed when the mirrors were positioned in front of the gamma camera. The developed system could measure the Ir-192 source positions in optical and gamma ray images. We conclude that the developed imaging system has the potential to measure the absolute position of an Ir-192 source in real-time clinical measurements.

SU-E-T-117: Absorbed Dose to Water Measurement with a Sandwich Method for High Dose-Rate Ir-192 Brachytherapy Sources

2011 ◽  
Vol 38 (6Part12) ◽  
pp. 3513-3513
Author(s):  
F Araki ◽  
F Yoshiyama ◽  
T Ohno ◽  
K Kakei ◽  
J Wulff
Keyword(s):  
Dose Rate ◽  
Absorbed Dose ◽  
High Dose Rate ◽  
High Dose ◽  
Sandwich Method ◽  
Absorbed Dose To Water ◽  
Water Measurement

scholarly journals PO-0769: A microDiamond for determination of absorbed dose around high-dose-rate 192Ir brachytherapy sources

2017 ◽  
Vol 123 ◽  
pp. S407
Author(s):  
V. Kaveckyte ◽  
A. Malusek ◽  
H. Benmaklouf ◽  
G. Alm Carlsson ◽  
A. Carlsson Tedgren
Keyword(s):  
Dose Rate ◽  
Absorbed Dose ◽  
High Dose Rate ◽  
High Dose

Suitability of microDiamond detectors for the determination of absorbed dose to water around high-dose-rate 192 Ir brachytherapy sources

2017 ◽  
Vol 45 (1) ◽  
pp. 429-437 ◽  
Author(s):  
Vaiva Kaveckyte ◽  
Alexandr Malusek ◽  
Hamza Benmakhlouf ◽  
Gudrun Alm Carlsson ◽  
Åsa Carlsson Tedgren
Keyword(s):  
Dose Rate ◽  
Absorbed Dose ◽  
High Dose Rate ◽  
High Dose ◽  
Absorbed Dose To Water

OC-0379: A novel absorbed dose standard for the calibration of 192Ir sources used in high dose rate brachytherapy

2014 ◽  
Vol 111 ◽  
pp. S146-S147
Author(s):  
M. D'Arienzo ◽  
A.S. Guerra ◽  
S. Loreti ◽  
C. Caporali ◽  
M. Pimpinella ◽  
...  
Keyword(s):  
Dose Rate ◽  
Absorbed Dose ◽  
High Dose Rate ◽  
High Dose ◽  
High Dose Rate Brachytherapy
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