Spirometer-guided breath-hold breast VMAT verified with portal images and surface tracking
نویسندگان
چکیده
Background and purposeFast rotating closed-bore gantry linacs are ideally suited for breath-hold treatments due to reduced imaging delivery times. We evaluated the reproducibility stability of spirometer-guided breast treatments, using intra-bore surface monitoring portal on Halcyon (Varian Medical Systems).Materials methodsSeven left-sided cancer patients were treated in SDX spirometer (Dyn’R) with an integrated boost volumetric arc protocol Halcyon. A dual depth-camera scanning system monitored left breast. The interfraction, intrafraction intrabreath-hold motion was determined anterior-posterior (AP) superior-inferior (SI) direction. Portal images (PI), acquired at a tangential angle manually registered planning-CT determine inter- errors SI tangential-anterior-posterior (“AP”) axis. Correlations between PI deviations investigated. To evaluate workflow efficiency, total time number breath-holds recorded.ResultsSystematic random variability amplitude below 0.7 mm AP 1.2 component as detected by (N = 130). Systematic retrieved from 140) “AP” 2.1 limited correlation found both axes (R2 0.27/0.38, p < 0.01). 75% fractions completed four 82% within 10 min.ConclusionSurface indicated VMAT radiotherapy can be accurately quickly performed linac. Intra-bore proved valuable technique breathing systems.
منابع مشابه
Dosimetric effects of intrafractional isocenter variation during deep inspiration breath‐hold for breast cancer patients using surface‐guided radiotherapy
The aim of this study was to investigate potential dose reductions to the heart, left anterior descending coronary artery (LAD), and ipsilateral lung for left-sided breast cancer using visually guided deep inspiration breath-hold (DIBH) with the optical surface scanning system Catalyst™, and how these potential dosimetric benefits are affected by intrafractional motion in between breath holds. ...
متن کاملCT reconstruction from portal images acquired during VMAT
Volumetric Modulated Arc Therapy (VMAT), a form of Intensity Modulated Arc Therapy (IMAT), has become a topic of research and clinical activity in recent years. As a form of arc therapy, portal images acquired during the treatment fraction form a (partial) Radon transform of the patient. We show that these portal images, when used in a modified global cone-beam Filtered Back-Projection (FBP) al...
متن کاملAutomated Registration of Sequential Breath-Hold DCE-MRI Images
S. Rajaraman, J. J. Rodriguez, C. Graff, M. I. Altbach, T. Dragovich, C. B. Sirlin, R. L. Korn, and N. Raghunand Electrical & Computer Engineering, The University of Arizona, Tucson, AZ, United States, Radiology, The University of Arizona, Tucson, AZ, United States, Cancer Center, The University of Arizona, Tucson, AZ, United States, Radiology, The University of California, San Diego, CA, Unite...
متن کاملChallenges of maintaining breath-hold conformity for breast patients while using the deep inspiration breath-hold technique
Deep inspiration breath-hold (DIBH) is used for whole breast radiotherapy, as a means of providing better dose homogeneity. This can be achieved by lower doses to the organs at risk, less patient movement and better set up. Most patients offered DIBH treatment are left-sided breast cancer, or ductal carcinoma in situ (DCIS) patients, due to the proximity of the heart to the chest wall so it is ...
متن کاملHold your breath!
R egeneration, the process by which an animal restores lost cells or body parts, occurs throughout the animal kingdom, including vertebrates, planarians and cnidarians such as hydra (Tanaka & Reddien, 2011). However, the ability to regenerate varies between species, and within a species it can be different for different body parts. Salamanders, such as axolotls and newts, possess the most impre...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Radiotherapy and Oncology
سال: 2021
ISSN: ['1879-0887', '0167-8140']
DOI: https://doi.org/10.1016/j.radonc.2021.01.016