SU-F-SPS-06: Implementation of a Back-Projection Algorithm for 2D in Vivo Dosimetry with An EPID System

2016 ◽  
Vol 43 (6Part4) ◽  
pp. 3351-3351
Author(s):  
B Hernandez Reyes ◽  
E Rodriguez Perez ◽  
M Sosa Aquino
Keyword(s):  
Projection Algorithm ◽  
In Vivo Dosimetry ◽  
Back Projection

scholarly journals A Validation Method for EPID In Vivo Dosimetry Algorithms

2021 ◽  
Vol 11 (22) ◽  
pp. 10715
Author(s):  
Marco Esposito ◽  
Livia Marrazzo ◽  
Eleonora Vanzi ◽  
Serenella Russo ◽  
Stefania Pallotta ◽  
...  
Keyword(s):  
Evaluation Method ◽  
Projection Algorithm ◽  
In Vivo Dosimetry ◽  
The Novel ◽  
Back Projection ◽  
Dose Distributions ◽  
Radiochromic Films ◽  
Dc Algorithm ◽  
The Brain

The aim of this study was to develop and apply an evaluation method for assessing the accuracy of a novel 3D EPID back-projection algorithm for in vivo dosimetry. The novel algorithm of Dosimetry Check (DC) 5.8 was evaluated. A slab phantom homogeneously filled, or with air and bone inserts, was used for fluence reconstruction of different squared fields. VMAT plans in different anatomical sites were delivered on an anthropomorphic phantom. Dose distributions were measured with radiochromic films. The 2D Gamma Agreement Index (GAI) between the DC and the film dose distributions (3%, 3 mm) was computed for assessing the accuracy of the algorithm. GAIs between films and TPS and between DC and TPS were also computed. The fluence reconstruction accuracy was within 2% for all squared fields in the three slabs’ configurations. The GAI between the DC and the film was 92.7% in the prostate, 92.9% in the lung, 96.6% in the head and the neck, and 94.6% in the brain. An evaluation method for assessing the accuracy of a novel EPID algorithm was developed. The DC algorithm was shown to be able to accurately reconstruct doses in all anatomic sites, including the lung. The methodology described in the present study can be applied to any EPID back-projection in vivo algorithm.

Diode in Vivo Dosimetry for Patients Receiving External Beam Radiation Therapy

10.37206/88 ◽  
2005 ◽  
Author(s):  
Ellen Yorke ◽  
Rodica Alecu ◽  
Li Ding ◽  
Doracy Fontenla ◽  
Andre Kalend ◽  
...  
Keyword(s):  
Radiation Therapy ◽  
External Beam Radiation Therapy ◽  
External Beam Radiation ◽  
In Vivo Dosimetry ◽  
External Beam ◽  
Beam Radiation

The use of prompt γ-rays for in-vivo dosimetry at therapeutic proton and ion beams

2011 ◽  
Author(s):  
F. Fiedler ◽  
U. Dersch ◽  
C. Golnik ◽  
T. Kormoll ◽  
A. Muller ◽  
...  
Keyword(s):  
Ion Beams ◽  
In Vivo Dosimetry

scholarly journals In vivo dosimetry and seed localization in prostate brachytherapy with permanent implants

2004 ◽  
Vol 51 (6) ◽  
pp. 3013-3018 ◽  
Author(s):  
A.B. Rosenfeld ◽  
D.L. Cutajar ◽  
M.L.F. Lerch ◽  
G.J. Takacs ◽  
J. Brady ◽  
...  
Keyword(s):  
In Vivo Dosimetry ◽  
Prostate Brachytherapy ◽  
Permanent Implants ◽  
Seed Localization

scholarly journals Transient ICD malfunctions during oncologic radiotherapy: a multi-centre, randomized, in-vitro study

2020 ◽  
Vol 41 (Supplement_2) ◽  
Author(s):  
E Di Girolamo ◽  
M Appignani ◽  
N Furia ◽  
M Marini ◽  
P De Filippo ◽  
...  
Keyword(s):  
Real Time ◽  
Treatment Plan ◽  
Low Energy ◽  
In Vivo Dosimetry ◽  
Implantable Cardioverter Defibrillators ◽  
Shock Delivery ◽  
Transient Electromagnetic ◽  
Direct Exposure

Abstract Background Direct exposure of implantable cardioverter-defibrillators (ICDs) during radiotherapy is still considered potentially harmful, or even unsafe, by manufacturers and current recommendations. The effects of photon beams on ICDs are unpredictable, depending on multiple factors, and malfunctions may present during exposure. Purpose To evaluate transient ICD malfunctions by direct exposure to doses up to 10 Gy during low-energy RT, forty-three contemporary wireless-enabled ICDs, with at least 4 months to elective replacement indicator (ERI) were evaluated in a real-time in-vitro session in three different centres. Methods All ICDs had baseline interrogation. Single chamber devices were programmed to the VVI/40 mode and dual or triple chamber devices were programmed to the DDD/40 mode. Rate response function and antitachycardia therapies were disabled, with the ventricular tachycardia (VT)/ventricular fibrillation (VF) detection windows still active. A centring computed tomography was performed to build the corresponding treatment plan and the ICDs were blinded randomized to receive either 2-, 5- or 10-Gy exposure by a low photon-energy linear accelerator (6MV) in a homemade water phantom (600 MU/min). The effective dose received by the ICDs was randomly assessed by an in-vivo dosimetry. During radiotherapy, the ICDs were observed in a real-time session using manufacturer specific programmer, and device function (pacing, sensing, programmed parameters, arrhythmia detections) was recorder by the video camera in the bunker throughout the entire photon exposure. All ICDs had an interrogation session immediately after exposure. Results During radiotherapy course, almost all ICDs (93%) recorded major or minor transient electromagnetic interferences. On detail, sixteen ICDs (37.2%) reported atrial and/or ventricular oversensing, with base-rate-pacing inhibition and VT/VF detection. Twenty-four ICDs (55.8%) recorded non clinically relevant noise, and no detections were observed. Only three ICDs (7%) reported neither transient malfunction nor minor noise, withstanding direct radiation exposure. At immediate post-exposure interrogation, the ICDs that recorded major real-time malfunctions had VT/VF detections stored in the device memory. In none of the ICDs spontaneous changes in parameter settings were reported. Malfunctions occurred regardless of either 2-, 5- or 10-Gy photon beam exposure. Conclusions Transient electromagnetic interferences were observed in most of the contemporary ICDs during radiotherapy course, regardless of photon dose. To avoid potentially life-threatening ICD malfunctions such as pacing inhibition or inappropriate shock delivery, magnet application on the pocket site or ICD reprogramming to the asynchronous mode are still suggested in ICD patients ongoing even low energy radiotherapy exposure. Funding Acknowledgement Type of funding source: None

Radiotherapy quality insurance by individualized in vivo dosimetry: State of the art

2009 ◽  
Vol 13 (3) ◽  
pp. 182-189 ◽  
Author(s):  
A. Ismail ◽  
J.-Y. Giraud ◽  
G.N. Lu ◽  
R. Sihanath ◽  
P. Pittet ◽  
...  
Keyword(s):  
State Of The Art ◽  
In Vivo Dosimetry ◽  
Quality Insurance

scholarly journals OC-0298: EPID dosimetry at the MR-Linac using a back-projection algorithm: proof of concept

2018 ◽  
Vol 127 ◽  
pp. S155-S156
Author(s):  
I. Torres Xirau ◽  
I. Olaciregui-Ruiz ◽  
B.J. Mijnheer ◽  
B. Vivas-Maiques ◽  
U.A. van der Heide ◽  
...  
Keyword(s):  
Projection Algorithm ◽  
Proof Of Concept ◽  
Back Projection ◽  
Epid Dosimetry ◽  
Algorithm Proof

In vivo dosimetry during DSA of the carotid and renal arteries. Deriviation of local DRLs

2009 ◽  
Vol 25 (4) ◽  
pp. 166-171 ◽  
Author(s):  
T. Topaltzikis ◽  
C. Rountas ◽  
I. Fezoulidis ◽  
C. Kappas ◽  
K. Theodorou
Keyword(s):  
Renal Arteries ◽  
In Vivo Dosimetry
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