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Journal of Applied Clinical Medical Physics

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https://www.readbyqxmd.com/read/29450985/effect-of-secondary-electron-generation-on-dose-enhancement-in-lipiodol-with-and-without-a-flattening-filter
#1
Daisuke Kawahara, Shuichi Ozawa, Akito Saito, Tomoki Kimura, Tatsuhiko Suzuki, Masato Tsuneda, Sodai Tanaka, Takeo Nakashima, Yoshimi Ohno, Yuji Murakami, Yasushi Nagata
PURPOSE: Lipiodol, which was used in transcatheter arterial chemoembolization before liver stereotactic body radiation therapy (SBRT), remains in SBRT. Previous we reported the dose enhancement in Lipiodol using 10 MV (10×) FFF beam. In this study, we compared the dose enhancement in Lipiodol and evaluated the probability of electron generation (PEG) for the dose enhancement using flattening filter (FF) and flattening filter free (FFF) beams. METHODS: FF and FFF for 6 MV (6×) and 10× beams were delivered by TrueBeam...
February 15, 2018: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/29450961/volumetric-based-image-guidance-is-superior-to-marker-based-alignments-for-stereotactic-body-radiotherapy-of-prostate-cancer
#2
Wen Li, Lan Lu, Kevin L Stephans, Naveen Sharma, Andrew Vassil, Zhilei Liu Shen, Abigail Stockham, Toufik Djemil, Rahul D Tendulkar, Ping Xia
PURPOSES: The aim of this study was to evaluate a dual marker-based and soft-tissue based image guidance for inter-fractional corrections in stereotactic body radiotherapy (SBRT) of prostate cancer. METHODS/MATERIALS: We reviewed 18 patients treated with SBRT for prostate cancer. An endorectal balloon was inserted at simulation and each treatment. Planning margins were 3 mm/0 mm posteriorly. Prior to each treatment, a dual image guidance protocol was applied to align three makers using stereoscopic x ray images and then to the soft tissue using kilo-voltage cone beam CT (kV-CBCT)...
February 15, 2018: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/29446235/quantitative-evaluation-of-the-performance-of-different-deformable-image-registration-algorithms-in-helical-axial-and-cone-beam-ct-images-using-a-mobile-phantom
#3
Imad Ali, Nesreen Alsbou, Justin Jaskowiak, Salahuddin Ahmad
The goal of this project is to investigate quantitatively the performance of different deformable image registration algorithms (DIR) with helical (HCT), axial (ACT), and cone-beam CT (CBCT). The variations in the CT-number values and lengths of well-known targets moving with controlled motion were evaluated. Four DIR algorithms: Demons, Fast-Demons, Horn-Schunck and Lucas-Kanade were used to register intramodality CT images of a mobile phantom scanned with different imaging techniques. The phantom had three water-equivalent targets inserted in a low-density foam with different lengths (10-40 mm) and moved with adjustable motion amplitudes (0-20 mm) and frequencies (0-0...
February 15, 2018: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/29436168/feasibility-study-of-individualized-optimal-positioning-selection-for-left-sided-whole-breast-radiotherapy-dibh-or-prone
#4
Hui Lin, Tianyu Liu, Chengyu Shi, Saskia Petillion, Isabelle Kindts, Caroline Weltens, Tom Depuydt, Yulin Song, Ziad Saleh, Xie George Xu, Xiaoli Tang
The deep inspiration breath hold (DIBH) and prone (P) position are two common heart-sparing techniques for external-beam radiation treatment of left-sided breast cancer patients. Clinicians select the position that is deemed to be better for tissue sparing based on their experience. This approach, however, is not always optimum and consistent. In response to this, we develop a quantitative tool that predicts the optimal positioning for the sake of organs at risk (OAR) sparing. Sixteen left-sided breast cancer patients were considered in the study, each received CT scans in the supine free breathing, supine DIBH, and prone positions...
February 13, 2018: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/29436163/using-geud-based-plan-analysis-method-to-evaluate-proton-vs-photon-plans-for-lung-cancer-radiation-therapy
#5
Zhiyan Xiao, Wei J Zou, Ting Chen, Ning J Yue, Salma K Jabbour, Rahul Parikh, Miao Zhang
The goal of this study was to exam the efficacy of current DVH based clinical guidelines draw from photon experience for lung cancer radiation therapy on proton therapy. Comparison proton plans and IMRT plans were generated for 10 lung patients treated in our proton facility. A gEUD based plan evaluation method was developed for plan evaluation. This evaluation method used normal lung gEUD(a) curve in which the model parameter "a" was sampled from the literature reported value. For all patients, the proton plans delivered lower normal lung V5 Gy with similar V20 Gy and similar target coverage...
February 13, 2018: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/29427312/evaluation-of-surface-and-shallow-depth-dose-reductions-using-a-superflab-bolus-during-conventional-and-advanced-external-beam-radiotherapy
#6
Jihyung Yoon, Yibo Xie, Rui Zhang
The purpose of this study was to evaluate a methodology to reduce scatter and leakage radiations to patients' surface and shallow depths during conventional and advanced external beam radiotherapy. Superflab boluses of different thicknesses were placed on top of a stack of solid water phantoms, and the bolus effect on surface and shallow depth doses for both open and intensity-modulated radiotherapy (IMRT) beams was evaluated using thermoluminescent dosimeters and ion chamber measurements. Contralateral breast dose reduction caused by the bolus was evaluated by delivering clinical postmastectomy radiotherapy (PMRT) plans to an anthropomorphic phantom...
February 10, 2018: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/29417728/comparison-of-four-techniques-for-spine-stereotactic-body-radiotherapy-dosimetric-and-efficiency-analysis
#7
Saif Aljabab, Balamurugan Vellayappan, Eric Vandervoort, Jamie Bahm, Robert Zohr, John Sinclair, Jean-Michel Caudrelier, Janos Szanto, Shawn Malone
PURPOSE: The aim of this study is to compare the dosimetric differences between four techniques for spine stereotactic body radiotherapy (SBRT): CyberKnife (CK), volumetric modulated arc therapy (VMAT), and helical tomotherapy (HT) with dynamic jaws (HT-D) and fixed jaws (HT-F). MATERIALS/METHODS: Data from 10 patients were utilized. All patients were planned for 24 Gy in two fractions, with the primary objectives being: (a) restricting the maximum dose to the cord to ≤ 17 Gy and/or cauda equina to ≤ 20 Gy, and (b) to maximize the clinical target volume (CTV) to receive the prescribed dose...
February 7, 2018: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/29417727/comp-report-cpqr-technical-quality-control-guidelines-for-brachytherapy-remote-afterloaders
#8
Normand Frenière
The Canadian Organization of Medical Physicists (COMP), in close partnership with the Canadian Partnership for Quality Radiotherapy (CPQR) has developed a series of Technical Quality Control (TQC) guidelines for radiation treatment equipment. These guidelines outline the performance objectives that equipment should meet in order to ensure an acceptable level of radiation treatment quality. The TQC guidelines have been rigorously reviewed and field tested in a variety of Canadian radiation treatment facilities...
February 7, 2018: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/29411529/three-dimensional-printing-ct-derived-objects-with-controllable-radiopacity
#9
Borhan Alhosseini Hamedani, Alexa Melvin, Kirubahara Vaheesan, Sameer Gadani, Keith Pereira, Andrew F Hall
PURPOSE: The goal of this work was to develop phantoms for the optimization of pre-operative computed tomography (CT) scans of the prostate artery, which are used for embolization planning. METHODS: Acrylonitrile butadiene styrene (ABS) pellets were doped with barium sulfate and extruded into filaments suitable for 3D printing on a fused deposition modeling (FDM) printer. Cylinder phantoms were created to evaluate radiopacity as a function of doping percentage. Small-diameter tree phantoms were created to assess their composition and dimensional accuracy...
February 7, 2018: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/29411526/assessment-of-multi-criteria-optimization-mco-for-volumetric-modulated-arc-therapy-vmat-in-hippocampal-avoidance-whole-brain-radiation-therapy-ha-wbrt
#10
Stephen Zieminski, Melin Khandekar, Yi Wang
This study compared the dosimetric performance of (a) volumetric modulated arc therapy (VMAT) with standard optimization (STD) and (b) multi-criteria optimization (MCO) to (c) intensity modulated radiation therapy (IMRT) with MCO for hippocampal avoidance whole brain radiation therapy (HA-WBRT) in RayStation treatment planning system (TPS). Ten HA-WBRT patients previously treated with MCO-IMRT or MCO-VMAT on an Elekta Infinity accelerator with Agility multileaf collimators (5-mm leaves) were re-planned for the other two modalities...
February 7, 2018: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/29411524/beam-profile-assessment-in-spectral-ct-scanners
#11
Marzieh Anjomrouz, Muhammad Shamshad, Raj K Panta, Lieza Vanden Broeke, Nanette Schleich, Ali Atharifard, Raja Aamir, Srinidhi Bheesette, Michael F Walsh, Brian P Goulter, Stephen T Bell, Christopher J Bateman, Anthony P H Butler, Philip H Butler
In this paper, we present a method that uses a combination of experimental and modeled data to assess properties of x-ray beam measured using a small-animal spectral scanner. The spatial properties of the beam profile are characterized by beam profile shape, the angular offset along the rotational axis, and the photon count difference between experimental and modeled data at the central beam axis. Temporal stability of the beam profile is assessed by measuring intra- and interscan count variations. The beam profile assessment method was evaluated on several spectral CT scanners equipped with Medipix3RX-based detectors...
February 7, 2018: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/29411506/a-simple-technique-to-improve-calculated-skin-dose-accuracy-in-a-commercial-treatment-planning-system
#12
Lilie Wang, Anthony J Cmelak, George X Ding
Radiation dermatitis during radiotherapy is correlated with skin dose and is a common clinical problem for head and neck and thoracic cancer patients. Therefore, accurate prediction of skin dose during treatment planning is clinically important. The objective of this study is to evaluate the accuracy of skin dose calculated by a commercial treatment planning system (TPS). We evaluated the accuracy of skin dose calculations by the anisotropic analytical algorithm (AAA) implemented in Varian Eclipse (V.11) system...
February 6, 2018: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/29396894/convolution-based-modified-clarkson-integration-cmci-for-electron-cutout-factor-calculation
#13
Jina Chang, Mu-Han Lin, Weiguo Lu, Mingli Chen, Steve Jiang
Electron therapy is widely used to treat shallow tumors because of its characteristic sharp dose fall-off beyond a certain range. A customized cutout is typically applied to block radiation to normal tissues. Determining the final monitor unit (MU) for electron treatment requires an output factor for the cutout, which is usually generated by measurement, especially for highly irregular cutouts. However, manual measurement requires a lengthy quality assurance process with possible errors. This work presents an accurate and efficient cutout output factor prediction model, convolution-based modified Clarkson integration (CMCI), to replace patient-specific output factor measurement...
February 3, 2018: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/29396881/jean-st-germain-m-s
#14
Lawrence Rothenberg, Lawrence Dauer
No abstract text is available yet for this article.
February 3, 2018: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/29388325/does-intensity-modulation-increase-target-dose-calculation-errors-of-conventional-algorithms-for-lung-sbrt
#15
Dandan Zheng, Vivek Verma, Shuo Wang, Xiaoying Liang, Sumin Zhou
PURPOSE: Conventional dose algorithms (Type A and Type B) for lung SBRT can display considerable target dose errors compared to Type-C algorithms. Intensity-modulated techniques (IMRT/VMAT) are increasingly being utilized for lung SBRT. Therefore, our study aimed to assess whether intensity modulation increased target dose calculation errors by conventional algorithms over conformal techniques. METHODS: Twenty lung SBRT patients were parallely planned with both IMRT and dynamic conformal arc (DCA) techniques using a Type-A algorithm, and another 20 patients were parallely planned with IMRT, VMAT, and DCA using a Type-B algorithm...
February 1, 2018: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/29388320/geometric-accuracy-of-the-mr-imaging-techniques-in-the-presence-of-motion
#16
Tarraf Torfeh, Rabih Hammoud, Tarek El Kaissi, Maeve McGarry, Souha Aouadi, Hadi Fayad, Noora Al-Hammadi
Magnetic Resonance Imaging (MRI) is increasingly being used for improving tumor delineation and tumor tracking in the presence of respiratory motion. The purpose of this work is to design and build an MR compatible motion platform and to use it for evaluating the geometric accuracy of MR imaging techniques during respiratory motion. The motion platform presented in this work is composed of a mobile base made up of a flat plate and four wheels. The mobile base is attached from one end and through a rigid rod to a synchrony motion table by Accuray® placed at the end of the MRI table and from the other end to an elastic rod...
February 1, 2018: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/29377561/automatic-patient-positioning-and-gating-window-settings-in-respiratory-gated-stereotactic-body-radiation-therapy-for-pancreatic-cancer-using-fluoroscopic-imaging
#17
Niclas Pettersson, Daniel Simpson, Todd Atwood, Jona Hattangadi-Gluth, James Murphy, Laura Cerviño
Before treatment delivery of respiratory-gated radiation therapy (RT) in patients with implanted fiducials, both the patient position and the gating window thresholds must be set. In linac-based RT, this is currently done manually and setup accuracy will therefore be dependent on the skill of the user. In this study, we present an automatic method for finding the patient position and the gating window thresholds. Our method uses sequentially acquired anterior-posterior (AP) and lateral fluoroscopic imaging with simultaneous breathing amplitude monitoring and intends to reach 100% gating accuracy while keeping the duty cycle as high as possible...
January 27, 2018: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/29377492/comp-report-cqpr-technical-quality-control-guidelines-for-treatment-planning-systems
#18
Jose E Villarreal-Barajas
The Canadian Organization of Medical Physicists (COMP), in close partnership with the Canadian Partnership for Quality Radiotherapy (CPQR) has developed a series of Technical Quality Control (TQC) guidelines for radiation treatment equipment. These guidelines outline the performance objectives that equipment should meet in order to ensure an acceptable level of radiation treatment quality. The TQC guidelines have been rigorously reviewed and field tested in a variety of Canadian radiation treatment facilities...
January 27, 2018: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/29377476/comp-report-cpqr-technical-quality-control-guidelines-for-cyberknife%C3%A2-technology
#19
Eric Vandervoort, Horacio Patrocinio, Tom Chow, Emilie Soisson, Dominic Béliveau Nadeau
The Canadian Organization of Medical Physicists (COMP), in close partnership with the Canadian Partnership for Quality Radiotherapy (CPQR) has developed a series of Technical Quality Control (TQC) guidelines for radiation treatment equipment. These guidelines outline the performance objectives that equipment should meet in order to ensure an acceptable level of radiation treatment quality. This particular TQC contains detailed performance objectives and safety criteria for CyberKnife® Technology. The quality control recommendations in this document are based upon previously published guidelines and the collective experience of all Canadian sites using this technology...
January 26, 2018: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/29369463/evaluation-of-the-accuracy-and-clinical-practicality-of-a-calculation-system-for-patient-positional-displacement-in-carbon-ion-radiotherapy-at-five-sites
#20
Yoshiki Kubota, Hayato Hayashi, Satoshi Abe, Saki Souda, Ryosuke Okada, Takayoshi Ishii, Mutsumi Tashiro, Masami Torikoshi, Tatsuaki Kanai, Tatsuya Ohno, Takashi Nakano
PURPOSE: We developed a system for calculating patient positional displacement between digital radiography images (DRs) and digitally reconstructed radiography images (DRRs) to reduce patient radiation exposure, minimize individual differences between radiological technologists in patient positioning, and decrease positioning time. The accuracy of this system at five sites was evaluated with clinical data from cancer patients. The dependence of calculation accuracy on the size of the region of interest (ROI) and initial position was evaluated for clinical use...
January 25, 2018: Journal of Applied Clinical Medical Physics
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