Comparison of 3-dimensional dose reconstruction system between fluence-based system and dose measurement-guided system

Journal Article · Sat Oct 01 04:00:00 EDT 2016 · Medical Dosimetry

DOI:https://doi.org/10.1016/J.MEDDOS.2016.03.001· OSTI ID:22685148

Nakaguchi, Yuji ^[1]; Ono, Takeshi ^[2]; Onitsuka, Ryota ^[3]; Maruyama, Masato; Shimohigashi, Yoshinobu; Kai, Yudai ^[1]

---

1. Department of Radiological Technology, Kumamoto University Hospital, Kumamoto (Japan)
2. Faculty of Life Sciences, Kumamoto University, Kumamoto (Japan)
3. Graduate School of Health Sciences, Kumamoto University, Kumamoto (Japan)

COMPASS system (IBA Dosimetry, Schwarzenbruck, Germany) and ArcCHECK with 3DVH software (Sun Nuclear Corp., Melbourne, FL) are commercial quasi-3-dimensional (3D) dosimetry arrays. Cross-validation to compare them under the same conditions, such as a treatment plan, allows for clear evaluation of such measurement devices. In this study, we evaluated the accuracy of reconstructed dose distributions from the COMPASS system and ArcCHECK with 3DVH software using Monte Carlo simulation (MC) for multi-leaf collimator (MLC) test patterns and clinical VMAT plans. In a phantom study, ArcCHECK 3DVH showed clear differences from COMPASS, measurement and MC due to the detector resolution and the dose reconstruction method. Especially, ArcCHECK 3DVH showed 7% difference from MC for the heterogeneous phantom. ArcCHECK 3DVH only corrects the 3D dose distribution of treatment planning system (TPS) using ArcCHECK measurement, and therefore the accuracy of ArcCHECK 3DVH depends on TPS. In contrast, COMPASS showed good agreement with MC for all cases. However, the COMPASS system requires many complicated installation procedures such as beam modeling, and appropriate commissioning is needed. In terms of clinical cases, there were no large differences for each QA device. The accuracy of the compass and ArcCHECK 3DVH systems for phantoms and clinical cases was compared. Both systems have advantages and disadvantages for clinical use, and consideration of the operating environment is important. The QA system selection is depending on the purpose and workflow in each hospital.

• OSTI ID: 22685148
• Journal Information: Medical Dosimetry, Journal Name: Medical Dosimetry Journal Issue: 3 Vol. 41; ISSN 0958-3947
• Country of Publication: United States
• Language: English

Related Subjects

61 RADIATION PROTECTION AND DOSIMETRY
62 RADIOLOGY AND NUCLEAR MEDICINE
ACCURACY
COLLIMATORS
COMMISSIONING
COMPARATIVE EVALUATIONS
COMPASS-D TOKAMAK
COMPUTER CODES
COMPUTERIZED SIMULATION
DOSIMETRY
EQUIPMENT
HOSPITALS
MONTE CARLO METHOD
PHANTOMS
PLANNING
QUALITY ASSURANCE
QUALITY MANAGEMENT
RADIATION DOSE DISTRIBUTIONS
RADIATION DOSES
RADIOTHERAPY
VALIDATION
VERIFICATION