Feasibility study of total marrow irradiation using helical tomotherapy

Chea, M.; Llagostera, C.; Meyer, P; Cristina, Karen; Itti, R.; Culot, F.; Marzi, Ludovic De; Cuenca, X.; Mahé, M.‐A.; Jj, Mazeron; Lisbona, A.; Jenny, C.

doi:10.1016/j.ejmp.2013.08.120

Cited by 1 publication

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“…Tomotherapy units have been found to suffer from output variation (18,19) with gantry angle (20) and also with time, and it has been suggested that, if the output remains within 2% of the average, this effect will not produce clinically significant variations from planned doses (4,21) . This output variation has been shown in some cases to have a minimal clinical impact (19,22,23) since each planned dose voxel is typically irradiated by multiple beamlets (over multiple gantry angles).…”

Section: Introductionmentioning

confidence: 99%

First experiences in using a dose control system on a TomoTherapy Hi·Art II

Moutrie

Lancaster

2015

J Applied Clin Med Phys

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The purpose of this study was to investigate the impact of a dose control system (DCS) servo installed on two fully commissioned TomoTherapy Hi·Art II treatment units. This servo is designed to actively adjust machine parameters to control the output variation of a tomotherapy unit to within ±0.5normal% of the nominal dose rate. Machine output, dose rate, and patient‐specific quality assurance data were retrospectively analyzed for periods prior to and following the installation of the servo system. Quality assurance tests indicate a reduction in the rotational variation of the output during a procedure, where the peak‐to‐peak amplitude of the variation was ±1.30 prior to DCS and equal to ±0.4 with DCS. Comparing two tomotherapy unit static outputs over four years the percentage error was 1.05normal%±0.7normal% and −0.4normal%±0.66normal% and, once DCS was installed, was reduced to −0.22normal%±0.29normal% and −0.08normal%±0.16normal% . The results of the quality assurance tests indicate that the dose control system reduced the output variation of each machine for both static and rotational delivery, leading to an improvement in the overall performance of the machine and providing greater certainty in treatment delivery.PACS number: 87.56.‐v, 87.56.bd, 87.55.Qr, 87.56.Fc

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