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Patient set-up corrections, obtained by registering the planning CT with CBCT, were used as the gold standard. CBCT, surface acquisition (SA), and two orthogonal portal images (PI) were acquired during the first four treatment sessions. Twenty patients were included in this study.
Iview tablet manual skin#
The aim of this study was to compare surface imaging, portal imaging, and skin marker set-up in radiotherapy of thoracic and pelvic regions, using cone beam computed tomography (CBCT) data as the gold standard. The results obtained with iView and PIPSpro were nearly equivalent. When thicker CT slices are considered, the global accuracy of both methods worsens, and differences larger than 1.5° between the rotation parameters estimated with iView and PIPSpro are evident. Using a DRR extracted from a 2 mm CT study, the overall accuracy of both methods was about 2 mm and 1°. For DRRs, four treatment planning systems (TPS) and three CT studies with different slice thicknesses were considered.This study demonstrates that the intrinsic accuracy of iView and PIPSpro were within 1 pixel and 1°.
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The intrinsic accuracy was tested using a computer generated phantom, while the overall accuracy was evaluated registering the portal images and the DRRs of an Alderson RANDO phantom.
Iview tablet manual manual#
The aim of this work is to assess the intrinsic and the global accuracy of iView and PIPSpro, two widely used registration software programs that implement a manual and a semiautomatic approach, respectively. If the registration is not reliable, the patient positioning will not be accurate. The output of the registration between the portal image and the reference DRR indicates the patient displacement.
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In radiotherapy, treatment portal images and digitally reconstructed radiographs (DRRs) are used to monitor patient setup during clinical routine.