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Resultados filtrados por Publicador: Department of Biomedical Imaging, Faculty of Medicine, University of Malaya, Malaysia

‣ A review on the clinical implementation of respiratory-gated radiation therapy

Saw, CB; Brandner, E; Selvaraj, R; Chen, H; Saiful Huq, M; Heron, DE
Fonte: Department of Biomedical Imaging, Faculty of Medicine, University of Malaya, Malaysia Publicador: Department of Biomedical Imaging, Faculty of Medicine, University of Malaya, Malaysia
Tipo: Artigo de Revista Científica
Publicado em 01/01/2007 Português
Relevância na Pesquisa
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Respiratory-gated treatment techniques have been introduced into the radiation oncology practice to manage target or organ motions. This paper will review the implementation of this type of gated treatment technique where the respiratory cycle is determined using an external marker. The external marker device is placed on the abdominal region between the xyphoid process and the umbilicus of the patient. An infrared camera tracks the motion of the marker to generate a surrogate for the respiratory cycle. The relationship, if any, between the respiratory cycle and the movement of the target can be complex. The four-dimensional computed tomography (4DCT) scanner is used to identify this motion for those patients that meet three requirements for the successful implementation of respiratory-gated treatment technique for radiation therapy. These requirements are (a) the respiratory cycle must be periodic and maintained during treatment, (b) the movement of the target must be related to the respiratory cycle, and (c) the gating window can be set sufficiently large to minimise the overall treatment time or increase the duty cycle and yet small enough to be within the gate. If the respiratory-gated treatment technique is employed, the end-expiration image set is typically used for treatment planning purposes because this image set represents the phase of the respiratory cycle where the anatomical movement is often the least for the longest time. Contouring should account for tumour residual motion...