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https://www.readbyqxmd.com/read/28048814/su-f-j-123-ct-based-determination-of-dibh-variability-and-its-dosimetric-impact-on-post-mastectomy-plus-regional-nodal-radiation-therapy
#1
M Malin, H Kang, K Tatebe, Y Hasan, S Chmura, H Al-Hallaq
PURPOSE: Breast cancer radiotherapy delivered using voluntary deep inspiration breath-hold (DIBH) requires reproducible breath holds, particularly when matching supraclavicular fields to tangential fields. We studied the impact of variation in DIBHs on CTV and OAR dose metrics by comparing the dose distribution computed on two DIBH CT scans taken at the time of simulation. METHODS: Ten patients receiving 50Gy in 25 fractions to the left chestwall and regional lymph nodes were studied...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048808/su-f-j-19-robust-region-of-interest-roi-for-consistent-registration-on-deteriorated-surface-images
#2
H Kang, M Malin, S Chmura, Y Hasan, H Al-Hallaq
PURPOSE: For African-American patients receiving breast radiotherapy with a bolus, skin darkening can affect the surface visualization when using optical imaging for daily positioning and gating at deep-inspiration breath holds (DIBH). Our goal is to identify a region-of-interest (ROI) that is robust against deteriorating surface image quality due to skin darkening. METHODS: We study four patients whose post-mastectomy surfaces are imaged daily with AlignRT (VisionRT, UK) for DIBH radiotherapy and whose surface image quality is degraded toward the end of treatment...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048736/su-f-j-55-feasibility-of-supraclavicular-field-treatment-by-investigating-variation-of-junction-position-between-breast-tangential-and-supraclavicular-fields-for-deep-inspiration-breath-hold-dibh-left-breast-radiation
#3
H Zhao, V Sarkar, A Paxton, P Rassiah-Szegedi, Y Huang, M Szegedi, L Huang, F Su, B Salter
PURPOSE: To explore the feasibility of supraclavicular field treatment by investigating the variation of junction position between tangential and supraclavicular fields during left breast radiation using DIBH technique. METHODS: Six patients with left breast cancer treated using DIBH technique were included in this study. AlignRT system was used to track patient's breast surface. During daily treatment, when the patient's DIBH reached preset AlignRT tolerance of ±3mm for all principle directions (vertical, longitudinal, and lateral), the remaining longitudinal offset was recorded...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048690/su-f-j-22-lung-volumevariability-assessed-by-bh-cbct-in-3d-surface-image-guided-deep-inspirationbreath-hold-dibh-radiotherapy-for-left-sided-breast-cancer
#4
A Gutierrez, D Stanley, N Papanikolaou, R Crownover
PURPOSE: With the increasing use of DIBH techniques for left-sided breast cancer, 3D surface-image guided DIBH techniques have improved patient setup and facilitated DIBH radiation delivery. However, quantification of the daily separation between the heart and left breast still presents a challenge. One method of assuring separation is to ensure consistent left lung filling. With this in mind, the aim of this study is to retrospectively quantify left lung volume from weekly breath hold-CBCTs (bh-CBCT) of left-sided breast patients treated using a 3D surface imaging system...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048390/su-f-t-415-differences-in-lung-sparing-in-deep-inspiration-breath-hold-and-free-breathing-breast-plans-calculated-in-pinnacle-and-monaco
#5
D Saenz, S Stathakis
PURPOSE: Deep inspiration breath-hold (DIBH) is used for left-sided breast radiotherapy to spare the heart and lung. The magnitude of sparing has been shown to be significant. Monte Carlo, furthermore, has the potential to calculate most accurately the dose in the heterogeneous lung medium at the interface with the lung wall. The lung dose was investigated in Monaco to determine the level of sparing relative to that calculated in Pinnacle(3) . METHODS: Five patients undergoing DIBH radiotherapy on an Elekta Versa HD linear accelerator in conjunction with the Catalyst C-RAD surface imaging system were planned using Phillips Pinnacle(3) ...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048276/su-f-t-525-monitordeep-inspiratory-breathhold-with-a-laser-sensor-for-radiation-therapy-of-left-breast-cancer
#6
A Tai, D J Li, A Currey, X Allen Li
PURPOSE: Radiation therapy (RT) of left sided breast cancers with deep-inspiratory breathhold (DIBH) can reduce the dose to heart. The purpose of this study is to develop and test a new laser-based tool to improve ease of RT delivery using DIBH. METHODS: A laser sensor together with breathing monitor device (Anzai Inc., Japan) was used to record the surface breathing motion of phantom/volunteers. The device projects a laser beam to the chestwall and the reflected light creates a focal spot on a light detecting element...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047823/we-de-209-00-practical-implementation-of-deep-inspiration-breath-hold-techniques-for-breast-radiation-therapy
#7
Rebecca Howell
: Breast radiation therapy is associated with some risk of lung toxicity as well as cardiac toxicity for left-sided cases. Radiation doses to the lung and heart can be reduced by using the deep inspiration breath hold (DIBH) technique, in which the patient is simulated and treated during the deep inspiration phase of the breathing cycle. During DIBH, the heart is usually displaced posteriorly, inferiorly, and to the right, effectively expanding the distance between the heart and the breast/chest wall...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047632/we-de-209-03-spirometric-motion-management-system
#8
S Hadley
: Breast radiation therapy is associated with some risk of lung toxicity as well as cardiac toxicity for left-sided cases. Radiation doses to the lung and heart can be reduced by using the deep inspiration breath hold (DIBH) technique, in which the patient is simulated and treated during the deep inspiration phase of the breathing cycle. During DIBH, the heart is usually displaced posteriorly, inferiorly, and to the right, effectively expanding the distance between the heart and the breast/chest wall...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047261/su-f-t-254-dose-volume-histogram-dvh-analysis-of-breath-hold-vs-free-breathing-techniques-for-esophageal-tumors
#9
R Badkul, K Doke, D Pokhrel, N Aguilera, C Lominska
PURPOSE: Lung and heart doses and associated toxicity are of concern in radiotherapy for esophageal cancer. This study evaluates the dosimetry of deep-inspiration-breath-hold (DIBH) technique as compared to freebreathing(FB) using 3D-conformal treatment(3D-CRT) of esophageal cancer. METHODS: Eight patients were planned with FB and DIBH CT scans. DIBH scans were acquired using Varian RPM system. FB and DIBH CTs were contoured per RTOG-1010 to create the planning target volume(PTV) as well as organs at risk volumes(OAR)...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047169/we-de-209-01-dosimetric-benefits-of-dibh
#10
R Howell
: Breast radiation therapy is associated with some risk of lung toxicity as well as cardiac toxicity for left-sided cases. Radiation doses to the lung and heart can be reduced by using the deep inspiration breath hold (DIBH) technique, in which the patient is simulated and treated during the deep inspiration phase of the breathing cycle. During DIBH, the heart is usually displaced posteriorly, inferiorly, and to the right, effectively expanding the distance between the heart and the breast/chest wall...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046951/we-de-209-04-3d-surface-image-guided
#11
X Tang
: Breast radiation therapy is associated with some risk of lung toxicity as well as cardiac toxicity for left-sided cases. Radiation doses to the lung and heart can be reduced by using the deep inspiration breath hold (DIBH) technique, in which the patient is simulated and treated during the deep inspiration phase of the breathing cycle. During DIBH, the heart is usually displaced posteriorly, inferiorly, and to the right, effectively expanding the distance between the heart and the breast/chest wall...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046937/th-cd-207a-02-implementation-of-live-epid-based-inspiration-level-assessment-leila-for-deepinspiration-breath-hold-dibh-monitoring-using-mv-fluoroscopy
#12
J Lehmann, J Sun, M Doebrich, B Zwan, T Fuangrod, S Bhatia, P Greer
PURPOSE: As prior work has shown that current DIBH monitoring approaches using surrogate measures (marker block on chest) do not always correspond with the clinical quantity of interest (lung depth, LD), a software tool and workflow are introduced to use MV fluoroscopy during treatment for real-time / Live EPID-based Inspiration Level Assessment (LEILA). METHODS: A prototype software tool calculates and displays the LD during the treatment of left sided breast cancer...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046787/su-g-brc-13-model-based-classification-for-optimal-position-selection-for-left-sided-breast-radiotherapy-free-breathing-dibh-or-prone
#13
H Lin, T Liu, C Shi, S Petillion, I Kindts, X Tang, X Xu
PURPOSE: There are clinical decision challenges to select optimal treatment positions for left-sided breast cancer patients-supine free breathing (FB), supine Deep Inspiration Breath Hold (DIBH) and prone free breathing (prone). Physicians often make the decision based on experiences and trials, which might not always result optimal OAR doses. We herein propose a mathematical model to predict the lowest OAR doses among these three positions, providing a quantitative tool for corresponding clinical decision...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046502/we-de-209-02-active-breathing-control
#14
D Comsa
: Breast radiation therapy is associated with some risk of lung toxicity as well as cardiac toxicity for left-sided cases. Radiation doses to the lung and heart can be reduced by using the deep inspiration breath hold (DIBH) technique, in which the patient is simulated and treated during the deep inspiration phase of the breathing cycle. During DIBH, the heart is usually displaced posteriorly, inferiorly, and to the right, effectively expanding the distance between the heart and the breast/chest wall...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046429/su-f-t-418-evaluation-of-organs-at-risk-oar-sparing-in-left-breast-irradiation-techniques
#15
A Saini, C Hwang, I Das
PURPOSE: To compare dose to organs at risk (OAR) for left sided breast radiation therapy with comparable planning target volume (PTV) coverage in three techniques; free breathing in supine position (FB), deep inspirational breath hold in supine (DIBH) and free breathing in prone position (PP). METHODS: Ten left sided breast cancer patients suitable for this study underwent a CT scan in three techniques e.g. supine, FB and DIBH and prone position (PP). One radiation oncologist contoured the PTV and OAR (cardiac components) based on RTOG guidelines...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046292/we-de-209-05-self-held-breath-control-with-respiratory-monitoring-and-feedback-guidance
#16
K Gifford
: Breast radiation therapy is associated with some risk of lung toxicity as well as cardiac toxicity for left-sided cases. Radiation doses to the lung and heart can be reduced by using the deep inspiration breath hold (DIBH) technique, in which the patient is simulated and treated during the deep inspiration phase of the breathing cycle. During DIBH, the heart is usually displaced posteriorly, inferiorly, and to the right, effectively expanding the distance between the heart and the breast/chest wall...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046208/su-g-tep1-11-predictors-of-cardiac-and-lung-dose-sparing-in-dibh-for-left-breast-treatment
#17
N Cao, A Kalet, L Fang, C Dempsey, L Young, J Kim, N Mayr, M Lavilla, H Richardson, R McClure, J Meyer
PURPOSE: This retrospective study of left sided whole breast radiation therapy (RT) patients investigates possible predictive parameters correlating to cardiac and left lung dose sparing by deep inspiration breath-hold (DIBH) technique compared to free-breathing (FB). METHODS: Thirty-one patients having both DIBH and FB CT scans were included in the study. All patients were planned with a standard step-and-shoot tangential technique using MV photons, with prescription of 50Gy or 50...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28044346/technical-note-issues-related-to-external-marker-block-placement-for-deep-inspiration-breath-hold-breast-radiotherapy
#18
Leigh Conroy, Alexandra Guebert, Wendy L Smith
PURPOSE: It has been suggested that the Real-time Position Management (RPM) marker block should be placed directly on the breast or sternum to verify deep inspiration breath hold (DIBH) level for breast radiotherapy. We explore three potential issues with this practice: (a) surface dose effect of placing the marker block in the primary beam; (b) effect of marker block tilt on the accuracy of the RPM system; and (c) correlation between marker block positions on the patient surface and internal chest wall position...
November 21, 2016: Medical Physics
https://www.readbyqxmd.com/read/27929481/how-dose-sparing-of-cardiac-structures-correlates-with-in-field-heart-volume-and-sternal-displacement
#19
Taeho Kim, Kelli Reardon, Daniel M Trifiletti, Constance Geesey, Kaitlyn Sukovich, Edwin Crandley, Paul W Read, Krishni Wijesooriya
Cardiac irradiation increases the risk of coronary artery disease in patients with left-sided breast cancer. Techniques exist to reduce cardiac irradiation, but the optimum technique depends on individual patient anatomy and physiology. We investigated the correlation of delta heart volume in field (dHVIF) and sternal excursion with dose sparing in heart and left anterior descending artery (LAD) to develop quantitative predictive models for expected dose to heart and LAD. A treatment planning study was performed on 97 left-breast cancer patients who underwent whole breast radiotherapy (prescription dose = 50 Gy) under deep inspiratory breath hold (DIBH)...
November 8, 2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/27921121/a%C3%A2-4d-ultrasound-real-time-tracking-system-for-external-beam-radiotherapy-of-upper-abdominal-lesions-under-breath-hold
#20
Dwi Seno Kuncoro Sihono, Lena Vogel, Christel Weiß, Johannes Thölking, Frederik Wenz, Frank Lohr, Judit Boda-Heggemann, Hansjörg Wertz
BACKGROUND AND PURPOSE: To evaluate a novel four-dimensional (4D) ultrasound (US) tracking system for external beam radiotherapy of upper abdominal lesions under computer-controlled deep-inspiration breath-hold (DIBH). MATERIALS AND METHODS: The tracking accuracy of the research 4D US system was evaluated using two motion phantoms programmed with sinusoidal and breathing patterns to simulate free breathing and DIBH. Clinical performance was evaluated with five healthy volunteers...
December 5, 2016: Strahlentherapie und Onkologie: Organ der Deutschen Röntgengesellschaft ... [et Al]
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