News | Quality Assurance (QA) | August 11, 2015

ACR Confirms Log File Measurements Acceptable for IMRT/VMAT QA

Log files can contribute to ACR Radiation Oncology Practice Accreditation as long as they verify actual radiation dose to the patient

ACR, log file measurements, IMRT, VMAT, QA, ROPA, accreditation, Mobius3D, Mobius Medical Systems

August 11, 2015 — The American College of Radiology (ACR) recently published a statement regarding its Radiation Oncology Practice Accreditation (ROPA) program for patient quality assurance (QA) and whether treatment machine log files are an acceptable alternative measurement for IMRT/VMAT. According to the ACR, log files are acceptable as long as they are generated using the patient’s IMRT/VMAT (intensity modulated radiation therapy/volumetric arc therapy) plan before the start of patient treatment; and that the medical physicist, along with the radiation oncologist have assured the measurements verify the actual radiation doses the patient will receive. Two-dimensional detector arrays are specified as another ‘alternative’ method in the ACR-ASTRO Practice Guidelines for IMRT.

Mobius Medical System’s Mobius3D software is the only commercially available system utilizing measured log files to perform patient specific end-to-end testing. Mobius3D uses the measured data from log files and a proprietary collapsed-cone convolution-superposition algorithm to determine three-dimensional dose to the patient.  The process is completely automated and requires only the time needed to deliver the treatment fields.

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