ESTRO 2022 - Abstract Book

S1655

Abstract book

ESTRO 2022

Confidence levels increased for all topics surveyed. This was across all staff surveyed regardless of staff skill level. Average time in room per patients was 10:22mins (range 11:09-09:19). Patient numbers treated on Halcyon exceeded those on other linacs (iX) from the start of 4th week of operation with up to 51patients treated per day. This represents an absolute increase in number of patients treated per day on other linacs over the same period, which treated an average of 32 patients per day (range 28.5-35.3).

Conclusion After a minimum of 1 day on Halcyon, radiographers advised increased confidence levels in achieving timings and maintaining patient care levels. They also showed increased confidence in matching CBCTs, with the greatest rise seen in newly qualified radiographers. While treating more patients than any other linac, in-room times under 11 mins per patient were routinely achieved. The structure of the day was very important and including hourly 10 min catch up bookings facilitated a smooth workflow.

PO-1867 Measured door to door vs. estimated treatment times on CyberKnife M6 system

M. Vekas 1 , G. Stelczer 1 , T. Major 1 , Z. Takacsi-Nagy 1 , C. Polgar 1

1 National Institute of Oncology, Center of Radiotherapy, Budapest, Hungary

Purpose or Objective The first aim of our study was to optimize our patient appointment schedule by comparing the estimated treatment times of the Precision treatment planning system to the real, measured door-to-door treatment times on our CyberKnife M6 system. The second aim of the study was to investigate the time reducing efficiency of the newly introduced VOLO optimizer algorithm. Materials and Methods Estimated treatment times of 80 patients were calculated and then compared in the following tumour localisations: cranial with one target, cranial with multiple (2-3) targets, spine, lung, breast and prostate. First, treatment times estimated by the planning system were calculated, then the door-to-door times were measured. Later, the treatment times estimated by the VOLO algorithm were compared with the sequential algorithm for another group of 78 patients. T-test was used in both methods for statistical analysis. Results There were significant differences between the calculated and the measured treatment times in all regions (p<0,05) except for the breast (p=0,087). In all cases, the measured treatment time was higher. The average increase of treatment time by