Method to assess the need for re-planning HDR brachytherapy tandem and ring treatments
High dose rate (HDR) brachytherapy procedures for cervical cancer require multiple applicator insertions for multiple (typically 5) fractions of a single plan, which carries a risk for variability in applicator position between fractions. Due to applicator displacement relative to patient anatomy, the dose to nearby organs-at-risk (OARs) may vary significantly from one fraction to the next. The purpose of this study was to evaluate the effect of changes in HDR tandem and ring (T&R) applicator position on doses to nearby OARs and to present a quick and simple method to estimate doses to OARs inter-fractionally without havin...
Source: Medical Dosimetry - April 14, 2024 Category: Radiology Authors: Tara Gray, Sheen Cherian, Sudha Amarnath, Bingqi Guo, Ping Xia, Allan Wilkinson Tags: Research Article Source Type: research
DIBH reduces right coronary artery and lung radiation dose in right breast cancer loco-regional radiotherapy
To determine whether deep inspiratory breath-hold (DIBH) reduces dose to organs-at-risk (OAR), in particular the right coronary artery (RCA), in women with breast cancer requiring right-sided post-mastectomy radiotherapy (PMRT) including internal mammary chain (+IMC) radiotherapy (RT).Fourteen consecutive women requiring right-sided PMRT + IMC were retrospectively identified. Nodal delineation was in accordance with European Society for Radiology and Oncology (ESTRO) guidelines and tangential chest wall fields marked. (Source: Medical Dosimetry)
Source: Medical Dosimetry - April 6, 2024 Category: Radiology Authors: Ebony Gough, Simon Ashworth, Trevor Moodie, Wei Wang, Karen Byth, Rachael Beldham-Collins, Jacqueline Buck, Samer Ghattas, Lucinda Burke, Kirsty E. Stuart Tags: Research Article Source Type: research
Comparative analysis of two dose-volume histogram prediction tools for treatment planning in volumetric-modulated arc therapy: A multi-planner study
This study explored the use of dose-volume histogram (DVH) prediction tools to address these disparities, specifically focusing on RapidPlan (Varian Medical Systems) and PlanIQ (Sun Nuclear). RapidPlan predicts achievable DVHs and automatically generates optimization objectives. (Source: Medical Dosimetry)
Source: Medical Dosimetry - March 30, 2024 Category: Radiology Authors: Motoharu Sasaki, Yuji Nakaguchi, Takeshi Kamomae, Akira Tsuzuki, Soma Sawada, Koki Shibuya, Masataka Oita, Masahide Tominaga, Yuki Tominaga, Hitoshi Ikushima Tags: Research Article Source Type: research
Evaluation of the trend of set-up errors during the treatment period using set-up margin in prostate radiotherapy
This study aimed to develop an evaluation method of the temporal trends in a patient's specific prostate movement during treatment using image matching and margin values. This study included 65 patients who underwent prostate volumetric modulated arc therapy (mean treatment time, 87.2 s). (Source: Medical Dosimetry)
Source: Medical Dosimetry - March 30, 2024 Category: Radiology Authors: Hinako Sasaki, Takumi Morishita, Naho Irie, Rena Kojima, Tetsukazu Kiriyama, Akira Nakamoto, Kunio Nishioka, Shotaro Takahashi, Yoshinori Tanabe Tags: Research Article Source Type: research
Clinical application of an institutional fractionated stereotactic radiosurgery (FSRS) program for brain metastases delivered with MRIdian Ⓡ BrainTx™
Single-fraction stereotactic radiosurgery (SRS) or fractionated SRS (FSRS) are well established strategies for patients with limited brain metastases. A broad spectrum of modern dedicated platforms are currently available for delivering intracranial SRS/FSRS; however, SRS/FSRS delivered using traditional CT-based platforms relies on the need for diagnostic MR images to be coregistered to planning CT scans for target volume delineation. Additionally, the on-board image guidance on traditional platforms yields limited inter-fraction and intra-fraction real-time visualization of the tumor at the time of treatment delivery. (S...
Source: Medical Dosimetry - March 1, 2024 Category: Radiology Authors: Alonso La Rosa, Kathryn E. Mittauer, Nema Bassiri, D Jay J. Wieczorek, Yongsook C. Lee, Amy E. Rzepczynski, Michael D. Chuong, Tugce Kutuk, Nicole C. McAllister, Matthew D. Hall, Alonso N. Gutierrez, Ranjini Tolakanahalli, Minesh P. Mehta, Rupesh Kotecha Source Type: research
Novel multileaf collimator designs with tongues and grooves in leaf end and Monte Carlo simulations
In this study, we proposed 2 new multileaf collimator leaf designs to eliminate leaf gaps for closed leaf pairs so that radiation leakage can be avoided. In the new designs, multi tongues and grooves were added to the conventional multileaf collimators leaf ends. Thus, when a pair of leaves closed, tongues of a leaf can enter grooves of its opposing leaf. Consequently, there would be no radiation leakage through closed leaves. One design was named finger-shaped MLC, and another design with doubled leaf end thickness was named hand-shaped MLC. (Source: Medical Dosimetry)
Source: Medical Dosimetry - February 23, 2024 Category: Radiology Authors: Weijie Cui, Yuan Tian, Jianrong Dai Tags: Research Article Source Type: research
Radiation Oncology Peer Review in a Community Setting: The Value of Prospective Review
Peer review is an important component of any radiation oncology continuous quality improvement program. While limited guidelines exist, there is no consensus about how peer review should be performed, and large variations exist among different institutions. The purpose of this report is to describe our experience with peer review at a busy Radiation Oncology clinic and to evaluate the difference between prospective and retrospective peer review. We also performed a failure modes and effects analysis (FMEA) of the peer review process. (Source: Medical Dosimetry)
Source: Medical Dosimetry - February 19, 2024 Category: Radiology Authors: Irena Dragojevi ć, David Hoopes, Gina Mansy, Douglas Rahn Source Type: research
Plan complexity metrics for head and neck VMAT competition plans
This study aimed to investigate the relationship between aperture-based plan complexity metrics (PCM) in volumetric modulated arc therapy (VMAT) competition plans and clinical treatment plans verified through patient-specific QA (PSQA). In addition, the association of PCMs with plan quality was examined. (Source: Medical Dosimetry)
Source: Medical Dosimetry - February 17, 2024 Category: Radiology Authors: Hiroyuki Okamoto, Akihisa Wakita, Kensuke Tani, Satoshi Kito, Masahiko Kurooka, Takumi Kodama, Naoki Tohyama, Yukio Fujita, Satoshi Nakamura, Kotaro Iijima, Takahito Chiba, Hiroki Nakayama, Miyuki Murata, Tomonori Goka, Hiroshi Igaki Source Type: research
Directed Journal Reading (DJR) Program, Spring 2024
(Source: Medical Dosimetry)
Source: Medical Dosimetry - February 8, 2024 Category: Radiology Source Type: research
New Members List & Corporate Members List, Spring 2024
(Source: Medical Dosimetry)
Source: Medical Dosimetry - February 8, 2024 Category: Radiology Source Type: research
Efficacy of flattening filter-free beams with the acuros XB algorithm in thoracic spine stereotactic body radiation therapy
This study aimed to determine the dosimetric value of flattening filter-free (FFF) beams compared to flattening filter (FF) beams using different algorithms in the treatment planning of thoracic spine stereotactic body radiation therapy (SBRT). A total of 120 plans were created for 15 patients using the Anisotropic Analytical Algorithm (AAA) and the Acuros External Beam (AXB) algorithm with FF and FFF beams at 6 MV and 10 MV energies. Various dosimetric parameters were evaluated, including target coverage, dose spillage, and organs-at-risk sparing of the spinal cord and esophagus. (Source: Medical Dosimetry)
Source: Medical Dosimetry - February 8, 2024 Category: Radiology Authors: Islam Tarek, Abdelrahman Hafez, Mohamed M. Fathy, Heba M. Fahmy, Dina M. Abdelaziz Tags: Research Article Source Type: research
Performance assessment of the surface-guided radiation therapy system: Varian Identify
This study presents a comprehensive performance evaluation of the Varian Identify SGRT system by using an anthropomorphic Alderson Rando phantom in three different aspects: (a) the accuracy and reproducibility of the system in different regions of interest (ROI) for varying couch displacements, (b) the setup accuracy of the system for patient positioning based on different computed tomography (CT) slice thicknesses, and (c) the potential influence of obstructing SGRT cameras by the gantry on the system's overall accuracy and reproducibility. (Source: Medical Dosimetry)
Source: Medical Dosimetry - February 5, 2024 Category: Radiology Authors: O ğuzhan Ayrancıoğlu, Ceren Ayrancıoğlu, Şerife Ceren Arıkan, Lütfiye Zümre Arıcan Alıcıkuş Tags: Research Article Source Type: research
Assessing dosimetric advancements in spatially fractionated radiotherapy: From grids to lattices
Spatially fractionated radiotherapy (SFRT) techniques have undergone transformative evolution, encompassing physical GRID therapy, MLC-based grids, virtual TOMO GRIDs, and 3-dimensional high-dose lattices. Historical roots trace back to Alban K öhler's pioneering Spatially fractionated grid therapy (SFGRT), utilizing physical grids for dose modulation. Technological innovations introduced multi-leaf collimators (MLCs), enabling adaptable spatial fractionation and a shift to the broader term “SFRT.” Physics and dosimetry-based studies have demonstrated the feasibility of computerized treatment planning and identified t...
Source: Medical Dosimetry - January 29, 2024 Category: Radiology Authors: Bhagyalakshmi AT, Ramasubramanian Velayudham Tags: Review Article Source Type: research
An introduction to low dose radiation therapy for shoulder osteoarthritis
Osteoarthritis (OA) is a painful, degenerative disease that affects the tissues of the joint spaces, such as the shoulder. Conventional medical treatment options, such as corticosteroid injections and anti-inflammatory medications, are not always sufficient to alleviate the symptoms from this disease. Low dose radiotherapy is a newer treatment option for patients with shoulder osteoarthritis and has shown positive outcomes. However, the problem is that there is a paucity of literature about treatment planning considerations for this new treatment option. (Source: Medical Dosimetry)
Source: Medical Dosimetry - January 23, 2024 Category: Radiology Authors: Madeleine Booth, Joseph M. Bryant, Meshan C. Curry, Nishele Lenards, Ashley Hunzeker, Ashley Cetnar Source Type: research
Dosimetric comparison of glioblastoma radiotherapy treatment plans on a low-field MRI-guided linear accelerator compared to conventional C-arm linear accelerator
The objective of this study is to compare curative treatment plans for glioblastoma tumors on a low-field MR-guided linac vs a C-arm linac and evaluate if they are comparable in terms of coverage, organ at risk sparing, delivery time, and deliverability. (Source: Medical Dosimetry)
Source: Medical Dosimetry - January 16, 2024 Category: Radiology Authors: Emily Moats, M. Salim Siddiqui, Parag Parikh, Karen Chin Snyder Source Type: research
