Yatman Tsang

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PURPOSE To develop a methodology for the use of a commercial detector array in dosimetry audits of rotational radiotherapy. MATERIALS AND METHODS The methodology was developed as part of the development of a national audit of rotational radiotherapy. Ten cancer centres were asked to create a rotational radiotherapy treatment plan for a three-dimensional(More)
BACKGROUND Rotational IMRT (VMAT and Tomotherapy) has now been implemented in many radiotherapy centres. An audit to verify treatment planning system modelling and treatment delivery has been undertaken to ensure accurate clinical implementation. MATERIAL AND METHODS 34 institutions with 43 treatment delivery systems took part in the audit. A virtual(More)
OBJECTIVES We assessed the impact of three-dimensional (3D) conformal planning vs conventional planning of preoperative chemoradiotherapy (CRT) for locally advanced rectal cancer (LARC) on small bowel and bladder sparing and in optimising coverage of tumour target volume. METHODS Conformal and conventional plans were created for 50 consecutive patients.(More)
PURPOSE External dosimetry audits give confidence in the safe and accurate delivery of radiotherapy. The RTTQA group have performed an on-site audit programme for trial recruiting centres, who have recently implemented static or rotational IMRT, and those with major changes to planning or delivery systems. METHODS Measurements of reference beam output(More)
OBJECTIVE This work investigated the delivery accuracy of different Varian linear accelerator models using log file-derived multileaf collimator (MLC) root mean square (RMS) values. METHODS Seven centres independently created a plan on the same virtual phantom using their own planning system, and the log files were analyzed following delivery of the plan(More)
OBJECTIVE To demonstrate the benefit of complexity metrics such as the modulation complexity score (MCS) and monitor units (MUs) in multi-institutional audits of volumetric-modulated arc therapy (VMAT) delivery. METHODS 39 VMAT treatment plans were analysed using MCS and MU. A virtual phantom planning exercise was planned and independently measured using(More)
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