Patient-specific quality assurance for proton depth dose distribution using a multi-layer ionization chamber in a single-ring wobbling method

2019 ◽  
Vol 12 (3) ◽  
pp. 305-311 ◽  
Author(s):  
Takahiro Kato ◽  
Kazuhiro Arai ◽  
Tatsuhiko Sagara ◽  
Ryohei Kato ◽  
Yuhei Yamazaki ◽  
...  
Keyword(s):  
Quality Assurance ◽  
Dose Distribution ◽  
Ionization Chamber ◽  
Patient Specific ◽  
Depth Dose ◽  
Single Ring ◽  
Depth Dose Distribution

Depth-dose Distribution Measurements and Calculations in an Elliptical Phantom

1983 ◽  
Vol 44 (1) ◽  
pp. 35-44
Author(s):  
J. Palfalvi ◽  
L. Koblinger ◽  
P. P. Szabo
Keyword(s):  
Dose Distribution ◽  
Depth Dose ◽  
Depth Dose Distribution

Electron Depth‐Dose Distribution Measurements in Finite Polystyrene Slabs

1972 ◽  
Vol 43 (7) ◽  
pp. 3191-3202 ◽  
Author(s):  
Marvin Rosenstein ◽  
Harvey Eisen ◽  
Joseph Silverman
Keyword(s):  
Dose Distribution ◽  
Depth Dose ◽  
Depth Dose Distribution

scholarly journals Development of a time-resolved mirrorless scintillation detector

PLoS ONE ◽  
2021 ◽  
Vol 16 (2) ◽  
pp. e0246742
Author(s):  
Wonjoong Cheon ◽  
Hyunuk Jung ◽  
Moonhee Lee ◽  
Jinhyeop Lee ◽  
Sung Jin Kim ◽  
...  
Keyword(s):  
Quality Assurance ◽  
Dose Rate ◽  
Dose Distribution ◽  
Scintillation Detector ◽  
Image Sensor ◽  
Geometric Distortion ◽  
Patient Specific ◽  
Rate Dependency ◽  
Time Resolved ◽  
Dose Profile

Purpose We developed a compact and lightweight time-resolved mirrorless scintillation detector (TRMLSD) employing image processing techniques and a convolutional neural network (CNN) for high-resolution two-dimensional (2D) dosimetry. Methods The TRMLSD comprises a camera and an inorganic scintillator plate without a mirror. The camera was installed at a certain angle from the horizontal plane to collect scintillation from the scintillator plate. The geometric distortion due to the absence of a mirror and camera lens was corrected using a projective transform. Variations in brightness due to the distance between the image sensor and each point on the scintillator plate and the inhomogeneity of the material constituting the scintillator were corrected using a 20.0 × 20.0 cm2 radiation field. Hot pixels were removed using a frame-based noise-reduction technique. Finally, a CNN-based 2D dose distribution deconvolution model was applied to compensate for the dose error in the penumbra region and a lack of backscatter. The linearity, reproducibility, dose rate dependency, and dose profile were tested for a 6 MV X-ray beam to verify dosimeter characteristics. Gamma analysis was performed for two simple and 10 clinical intensity-modulated radiation therapy (IMRT) plans. Results The dose linearity with brightness ranging from 0.0 cGy to 200.0 cGy was 0.9998 (R-squared value), and the root-mean-square error value was 1.010. For five consecutive measurements, the reproducibility was within 3% error, and the dose rate dependency was within 1%. The depth dose distribution and lateral dose profile coincided with the ionization chamber data with a 1% mean error. In 2D dosimetry for IMRT plans, the mean gamma passing rates with a 3%/3 mm gamma criterion for the two simple and ten clinical IMRT plans were 96.77% and 95.75%, respectively. Conclusion The verified accuracy and time-resolved characteristics of the dosimeter may be useful for the quality assurance of machines and patient-specific quality assurance for clinical step-and-shoot IMRT plans.

Khảo sát một số đặc tính bức xạ của buồng ion hóa CC13 và diode bán dẫn razor đối với các chùm photon kích thước nhỏ trên máy gia tốc tuyến tính xạ trị Clinac IX

2020 ◽  
Author(s):  
Tu Vu Ngoc
Keyword(s):  
Radiation Field ◽  
Dose Response ◽  
Dose Distribution ◽  
Ionization Chamber ◽  
Field Size ◽  
Photon Beams ◽  
Silicon Diode ◽  
Depth Dose ◽  
The Difference

Purpose: Compare percent depth dose (PDD) and off-center ratio (OCR) measured by the CC13 ionization chamber and the RAZOR silicon diode in small photon beams. Method and Materials: Some dosimetric characteristics, such as PDD, OCR, penumbra and radiation field size, were considered in this study for 2x2, 3x3, and 4x4 cm2 field sizes. We used the CC13 ionization chamber and the RAZOR silicon diode to measure dose distribution with depth along the axis and off-center of the beam. From the results obtained, the team investigated the differences in radiation parameters measured by the two types of probes above. Results: There are significant differences in the radiation parameters investigated for the CC13 ionization chamber and the RAZOR silicon diode, especially the width of penumbra. For PDD curves, the difference is less than 5% from dmax to 30 cm, however the difference becomes greater in the build-up region, which reaches to 33% at the water phatom surface. The width of penumbra measured by CC13 is always larger than that of RAZOR, the ratio of the penumbra width between two detectors is 1.8 and 1.3 for energies of 6 MV and 15 MV, respectively. Conclusion: The RAZOR silicon diode has better dose response than the CC13 ionization chamber for measuring the PDD and the OCR in small photon beams.

Comparative Study of Depth Dose Distribution of Fast Neutrons Using Solid State Nuclear Track Detectors

1991 ◽  
Vol 27 (4) ◽  
pp. 202-205
Author(s):  
H. R. Moustafa ◽  
M. S. Abdel-Wahab ◽  
N. El Enany ◽  
S. El Fiki ◽  
M. A. Sharaf ◽  
...  
Keyword(s):  
Solid State ◽  
Comparative Study ◽  
Dose Distribution ◽  
Fast Neutrons ◽  
Nuclear Track Detectors ◽  
Depth Dose ◽  
Depth Dose Distribution

Patient specific IMRT quality assurance with film, ionization chamber and detector arrays: Our institutional experience

2015 ◽  
Vol 115 ◽  
pp. 12-16 ◽  
Author(s):  
Wilbert Cruz ◽  
Ganesh Narayanasamy ◽  
Morgan Regan ◽  
Panayiotis Mavroidis ◽  
Niko Papanikolaou ◽  
...  
Keyword(s):  
Quality Assurance ◽  
Ionization Chamber ◽  
Patient Specific ◽  
Detector Arrays ◽  
Institutional Experience
Sign in / Sign up

Export Citation Format

Share Document