Publications by authors named "Masanobu Itano"
Purpose: This report covers the first multi-institutional study of independent monitor unit (MU)/dose calculation verification for the CyberKnife, Vero4DRT, and TomoTherapy radiotherapy delivery systems.
Methods: A total of 973 clinical treatment plans were collected from 12 institutions. Commercial software employing the Clarkson algorithm was used for verification after a measurement validation study, and the doses from the treatment planning systems (TPSs) and verification programs were compared on the basis of the mean value ± two standard deviations.
Article Synopsis
- A multi-institutional study was conducted to confirm the feasibility of using 3-5% action levels for independent monitor unit (MU) verification across 12 institutions, analyzing a total of 5936 fields.
- The results showed that the mean verification difference was 1.0 ± 3.6%, but larger discrepancies were noted specifically in breast and lung treatments, highlighting the need for careful analysis.
- It concluded that while the 5% action level is usable, clinicians must pay attention to the significant variations found in breast and lung treatment plans, especially related to field shape and reference point placements.
Purpose: A multi-institutional study was performed to identify the impact of different independent dose verification programs on independent dose verification software program.
Methods: Data for 1,543 treatment fields were collected in three institutions. RADCALC and Simple MU Analysis (Simple MU) using the Clarkson-based algorithm were used.
Article Synopsis
- * Researchers conducted a multi-institutional investigation into the precision of independent dose verifications using a wedge off-axis calculation and found improved agreement with treatment planning systems.
- * Results indicated that using the wedge off-axis calculation led to better confidence limits (around 2% for both physical and non-physical wedges) compared to over 5% without it, suggesting a tolerance level of 5% for these plans similar to conventional techniques.