Integrated megavoltage portal imaging with a 1.5 T MRI linac
| Autor: | Bas W. Raaymakers, Sjoerd P M Crijns, J. de Boer, K Smit, Mette K Stam, C Knox, J G M Kok, J.J.W. Lagendijk, M R van den Bosch |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
Computer science
Image quality Coordinate system Radiation Dosage Bone and Bones Pelvis Portal imaging Interference (communication) Limit of Detection Humans Radiology Nuclear Medicine and imaging Pelvic Bones Mri linac Radiological and Ultrasound Technology business.industry Phantoms Imaging Detector Image Enhancement Mr imaging Magnetic Resonance Imaging Radiography Transmission (telecommunications) Feasibility Studies Particle Accelerators Nuclear medicine business Biomedical engineering |
| Zdroj: | Physics in medicine and biology. 56(19) |
| ISSN: | 1361-6560 |
| Popis: | In this note, the feasibility of complementing our hybrid 1.5 T MRI linac (MRL) with a megavoltage (MV) portal imager is investigated. A standard aSi MV detector panel is added to the system and both qualitative and quantitative performances are determined. Simultaneous MR imaging and transmission imaging can be performed without mutual interference. The MV image quality is compromised by beam transmission and longer isocentre distance; still, the field edges and bony anatomy can be detected at very low dose levels of 0.4 cGy. MV imaging integrated with the MRL provides an independent and well-established position verification tool, a field edge check and a calibration for alignment of the coordinate systems of the MRI and the accelerator. The portal imager can also be a valuable means for benchmarking MRI-guided position verification protocols on a patient-specific basis in the introductory phase. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|