In part, this could be compensated for by increasing the CBCT exposure (mAs), and by increasing the separation between the isocenter and the kV detector from 50 to 80 cm. The new CBCT scatter correction algorithm was shown to offer promise of increasing HU accuracies. With the combined ...
A standard kV, 3mm slice-thickness scan was performed first, and a limited length MV-CBCT scan, in the same position, was acquired on a Siemens-Oncor with a first order scatter correction applied for window and level. Both image data sets were registered within a Pinnacle3 system (beta v...
Acquisition of MV-scatter-free kilovoltage CBCT images during RapidArc or VMAT PurposeTo perform kilovoltage (kV) cone beam computed tomography (CBCT) imaging concomitant with the delivery of megavoltage (MV) RapidArc treatment, and d... C Ling,P Zhang,T Etmektzoglou,... - 《Radiotherapy ...
12 Flattening-filter-free (FFF) RT has demonstrated higher dose rate, less head scatter, and less penumbra in comparison to flattening-filtered (FF) RT.13 Plan comparison studies between 6X-FFF O-ring linacs (ORL) and CALs have been performed in head and neck cancer,12,14,15 breast ...
CBCT scatter correction with dual-layer flat-panel detector Background: Recently, the popularity of dual-layer flat-panel detector (DL-FPD) based dual-energy cone-beam CT (DE-CBCT) imaging has been increasing. Howev... X Zhang,J Xie,T Su,... 被引量: 0发表: 2024年 Fast kV-switching ...
Acquisition of MV-scatter-free kilovoltage CBCT images during RapidArc鈩or VMATLingCliftonZhangPengpengEtmektzoglouThanosStarlackJoshMingshan
The kV Fastcat\nsimulation was performed using detailed models of the x-ray source, bowtie\nfilter, a high resolution voxelized virtual Catphan phantom, anti-scatter grid,\nand the CsI scintillating detector. Likewise, an MV Fastcat CBCT was simulated\nwith detailed models for the beam energy...
The megavoltage (MV) scatter effect on kV CBCT image quality was evaluated using parameters such as Hounsfield unit (HU) accuracy, spatial resolution, contrast-to-noise ratio (CNR) and spatial non-uniformity (SNU). These CBCT images... SA Yoganathan,KJ Maria Das,K Maria Midunvaleja,... ...
To address these limitations, a novel method was developed to generate hybrid kV/MV projections, and to correct metal artifacts in CBCTimages.Methods:First, a calibration dataset-based method was developed to correct beam hardening and scatter in kV and MV projections, and to convert MV ...
Scatter reduction, efficient detec... MA Speidel,BP Wilfley,JM Star-Lack,... - 《Medical Physics》 被引量: 123发表: 2006年 GPU-based fast low-dose cone beam CT reconstruction via total variation. X-ray imaging dose from serial Cone-beam CT (CBCT) scans raises a clinical concern in ...