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.
For more information: www.mobiusmed.com
March 24, 2026 
