Zobrazeno 1 - 10
of 29
pro vyhledávání: '"Paul Klahr"'
Publikováno v:
Journal of Applied Clinical Medical Physics
Purpose This work characterizes a novel exponential 4DCT reconstruction algorithm (EXPO), in phantom and patient, to determine its impact on image quality as compared to the standard cosine‐squared weighted 4DCT reconstruction. Methods A motion pla
Publikováno v:
Medical Physics. 45:2486-2497
Purpose This study aimed to quantitate the accuracy of the determination of electron density (ED), effective atomic number (Zeff ), and iodine concentration, directed for more accurate radiation therapy planning, with a new dual-layer dual-energy com
Autor:
Stephanie Soriano, Roshni A. Parikh, Paul Klahr, Michael Wien, Sheila C. Berlin, Ronald D. Novak, Leslie Ciancibello, David W. Jordan
Publikováno v:
Pediatric Radiology. 48:56-65
The size-specific dose estimate (SSDE) has emerged as an improved metric for use by medical physicists and radiologists for estimating individual patient dose. Several methods of calculating SSDE have been described, ranging from patient thickness or
Autor:
Siamak P. Nejad-Davarani, Carri K Glide-Hurst, Paul Klahr, Eric D. Morris, Xiaoxia Han, Heinrich Schulz, Noel Black, Daniel Mittelstaedt, Claudia Miller, Ahmed I Ghanem, Liran Goshen
Publikováno v:
Journal of Applied Clinical Medical Physics
Model‐based iterative reconstruction (MBIR) reduces CT imaging dose while maintaining image quality. However, MBIR reduces noise while preserving edges which may impact intensity‐based tasks such as auto‐segmentation. This work evaluates the se
Autor:
Wookjin Choi, M Kang, William F. Regine, Wei Lu, Ming Xue, Paul Klahr, Shifeng Chen, Warren D. D'Souza, Barton F. Lane, Kruti Patel, Jiahui Wang
Publikováno v:
Medical Physics. 43:5659-5666
Purpose To develop an individually optimized contrast-enhanced (CE) 4D-computed tomography (CT) for radiotherapy simulation in pancreatic ductal adenocarcinomas (PDA). Methods Ten PDA patients were enrolled. Each underwent three CT scans: a 4D-CT imm
Publikováno v:
Pediatric Radiology. 46:1234-1240
Size-specific dose estimate is gaining increased acceptance as the preferred index of CT dose in children. However it was developed based on non-clinical data. To compare the accuracy of size-specific dose estimate (SSDE) based on geometric and body
Autor:
Steven Van Hedent, Rivka Kessner, Kuan-Hao Su, Nico Buls, Raymond F. Muzic, Brendan L. Eck, Paul Klahr, Fan Liang, Jung-Wen Kuo, David W. Jordan, Pablo R. Ros
Publikováno v:
Journal of clinical densitometry : the official journal of the International Society for Clinical Densitometry. 22(3)
Introduction: Bone mineral density (BMD) analysis by Dual-Energy x-ray Absorptiometry (DXA) can have some false negatives due to overlapping structures in the projections. Spectral Detector CT (SDCT) can overcome these limitations by providing volume
Publikováno v:
Journal of Applied Clinical Medical Physics
The dosimetric impact of orthopedic metal artifact reduction (O‐MAR) on spine SBRT patients has not been comprehensively studied, particularly with spinal prostheses in high‐dose gradient regions. Using both phantom and patient datasets, we inves
Autor:
Bruce R. Whiting, Jeffrey F. Williamson, David G. Politte, Paul Klahr, Joshua D. Evans, Joseph A. O'Sullivan
Publikováno v:
Physica Medica. 29:500-512
To present a framework for characterizing the data needed to implement a polyenergetic model-based statistical reconstruction algorithm, Alternating Minimization (AM), on a commercial fan-beam CT scanner and a novel method for assessing the accuracy
Autor:
Hua Li, Camille Noel, Haijian Chen, H. Harold Li, Daniel Low, Kevin Moore, Paul Klahr, Jeff Michalski, Hiram A. Gay, Wade Thorstad, Sasa Mutic
Publikováno v:
Medical Physics. 39:7507-7517
Purpose: Severe artifacts in kilovoltage-CT simulation images caused by large metallic implants can significantly degrade the conspicuity and apparent CT Hounsfield number of targets and anatomic structures, jeopardize the confidence of anatomical se