2022/11/01 by Joonas Tikkanen, Tikkanen, Joonas, Jan Morelius +3
Medicine · Physics and Astronomy · #Advanced Radiotherapy Techniques #FOS: Physical sciences #Instrumentation and Detectors (physics.ins-det) #Medical Imaging Techniques and Applications #Medical Physics (physics.med-ph) #Radiation Dose and Imaging
paper · pdf · doi:10.48550/arxiv.2211.00413
openalex publication_date 2022/11/01 · openalex created_date 2022/11/07 · openalex updated_date 2026/07/28
In radiation beam-profile measurements, an accurate positioning of the detector with high position resolution is essential. For this purpose, we built a scanning device capable of moving a detector in three dimensions using mainly parts from a commercial 3D-printer. The accuracy and repeatability of movement was tested with caliper, laser displacement sensor, and repeated 60Co beam-profile measurements in a water phantom. The results from the caliper and the sensor showed position accuracy for the scanner to be better than ±150 μm. The standard deviation of the error in position from laser sensor measurements was approximately 30 μm and the beam profile scans showed a maximum deviation from the mean position of 50 μm. The effect of volume averaging correction factors on 60Co beam-profile was investigated with two different sized ionization chambers. The differences in the profiles were reduced significantly after applying the correction factors.