scholarly journals Direct measurement and correction of both megavoltage and kilovoltage scattered x‐rays for orthogonal kilovoltage imaging subsystems with dual flat panel detectors

2020 ◽  
Vol 21 (9) ◽  
pp. 143-154
Author(s):  
Hiraku Iramina ◽  
Mitsuhiro Nakamura ◽  
Takashi Mizowaki
Keyword(s):  
Direct Measurement ◽  
X Rays ◽  
Flat Panel ◽  
Flat Panel Detectors ◽  
Kilovoltage Imaging

scholarly journals Quantification and correction of the scattered X-rays from a megavoltage photon beam to a linac-mounted kilovoltage imaging subsystem

BJR|Open ◽  
2020 ◽  
Vol 2 (1) ◽  
pp. 20190048
Author(s):  
Hiraku Iramina ◽  
Mitsuhiro Nakamura ◽  
Yuki Miyabe ◽  
Nobutaka Mukumoto ◽  
Tomohiro Ono ◽  
...  
Keyword(s):  
Dose Rate ◽  
Scatter Correction ◽  
Image Contrast ◽  
X Rays ◽  
Flat Panel ◽  
Flat Panel Detector ◽  
Detector Position ◽  
Flattening Filter ◽  
Beam Parameters ◽  
Kilovoltage Imaging

Objective: To quantify and correct megavoltage (MV) scattered X-rays (MV-scatter) on an image acquired using a linac-mounted kilovoltage (kV) imaging subsystem. Methods and materials: A linac-mounted flat-panel detector (FPD) was used to acquire an image containing MV-scatter by activating the FPD only during MV beam irradiation. 6-, 10-, and 15 MV with a flattening-filter (FF; 6X-FF, 10X-FF, 15X-FF), and 6- and 10 MV without an FF (6X-FFF, 10X-FFF) were used. The maps were acquired by changing one of the irradiation parameters while the others remained fixed. The mean pixel values of the MV-scatter were normalized to the 6X-FF reference condition (MV-scatter value). An MV-scatter database was constructed using these values. An MV-scatter correction experiment with one full arc image acquisition and two square field sizes (FSs) was conducted. Measurement- and estimation-based corrections were performed using the database. The image contrast was calculated at each angle. Results: The MV-scatter increased with a larger FS and dose rate. The MV-scatter value factor varied substantially depending on the FPD position or collimator rotation. The median relative error ranges of the contrast for the image without, and with the measurement- and estimation-based correction were −10.9 to −2.9, and −1.5 to 4.8 and −7.4 to 2.6, respectively, for an FS of 10.0 × 10.0 cm2. Conclusions: The MV-scatter was strongly dependent on the FS, dose rate, and FPD position. The MV-scatter correction improved the image contrast. Advances in knowledge: The MV-scatters on the TrueBeam linac kV imaging subsystem were quantified with various MV beam parameters, and strongly depended on the fieldsize, dose rate, and flat panel detector position. The MV-scatter correction using the constructed database improved the image quality.

Development of quality control system for flat-panel detectors

2011 ◽  
Vol 4 (2) ◽  
pp. 164-172 ◽  
Author(s):  
Atsushi Teramoto ◽  
Takahiko Kajihara ◽  
Shoichi Suzuki ◽  
Kazuo Kinoshita ◽  
Masatoshi Tsuzaka ◽  
...  
Keyword(s):  
Quality Control ◽  
Control System ◽  
Quality Control System ◽  
Flat Panel ◽  
Flat Panel Detectors

Market Overview of Flat Panel Detectors for X-Ray Imaging

2010 ◽  
pp. 497-509
Author(s):  
Carl Lacasce ◽  
Larry Partain ◽  
Chuck Blouir
Keyword(s):  
Flat Panel ◽  
X Ray ◽  
X Ray Imaging ◽  
Flat Panel Detectors

Scintillating glass‐ceramic substrates for indirect flat panel detectors in digital radiography

2020 ◽  
Vol 103 (12) ◽  
pp. 6893-6900
Author(s):  
Russell L. Leonard ◽  
Danielle T. Berkowitz ◽  
Austin Thomas ◽  
Adrian Howansky ◽  
Anthony R. Lubinsky ◽  
...  
Keyword(s):  
Digital Radiography ◽  
Glass Ceramic ◽  
Flat Panel ◽  
Ceramic Substrates ◽  
Flat Panel Detectors

scholarly journals Gain and offset calibration reduces variation in exposure-dependent SNR among systems with identical digital flat-panel detectors

2011 ◽  
Vol 38 (7) ◽  
pp. 4422-4429 ◽  
Author(s):  
Charles E. Willis ◽  
Yevgeniy Y. Vinogradskiy ◽  
Brad K. Lofton ◽  
R. Allen White
Keyword(s):  
Flat Panel ◽  
Flat Panel Detectors

Charge collection and capacitance in continuous-film flat-panel detectors

2000 ◽  
Author(s):  
Marcelo Mulato ◽  
Francesco Lemmi ◽  
Rachel Lau ◽  
Jeng-Ping Lu ◽  
Jackson Ho ◽  
...  
Keyword(s):  
Charge Collection ◽  
Flat Panel ◽  
Continuous Film ◽  
Flat Panel Detectors
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