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• W2083254775 abstract "Purpose/Objective(s)Determine the potential role of LAP CBCT in Patient Positioning in Radiation Therapy.Materials/MethodsLimited-angle Partial (LAP) conebeam CT (CBCT) has been developed to position patients with various treatment sites such as prostate with seed implants, lung, head and neck with titanium implants, sarcoma patients with lower and upper extremities, and breast patient with boost plan. The LAP CBCT was implemented with Elekta XVI (version 3.5) and Synery Linear Accelerator utilizing the following characteristics: S20 option (with two house-made smaller options), 200o scanning angels for breast, and 100o scanning angels for other sites. Various phantoms were fabricated to determine the optimum parameters of LAP CBCT in clinical applications.ResultsFor breast, surgical clips were visible in three orthogonal planes even though the shape of the seroma was affected by other of parts of the patient body. The surgical clips were found to be migrated by 4-8 mm for 8 consecutive patients treated with 3D CFRT. The prostate patients with 4 seed implants, spinal SBRT, lung SBRT were involved to compare full CBCT with specific options for each treatment site (manufacturer-recommended option) and LAP CBCT. Geometrical differences between two techniques are 1-2 mm, which include the patient movements because of scanning time differences. For head and neck, with severe artifacts due to several implants, LAP CBCT introduces smaller artifacts for image fusion, even though the geometrical differences are on the order of inter-user- variations. For 3 sarcoma cases with setup of bent arms or thigh, patients' skin is distorted due to insufficient scanning angles, thus CT wires onto the skin or the immobilization devices are used to position the patient. TLDs are used to measure the dose to the skins.ConclusionsThe LAP CBCT is taken in shorter scanning time, and gives smaller doses to other part of radiation-sensitive organs, lens, thyroid, and testes. Geometrical distortions (aliasing artifacts) due to insufficient scanning angles should be considered to understand the limitation of the LAP CBCT. It reduces the treatment time, and patient motion compared with full CBCT. Also, we can treat patients without moving the table during radiation delivery. Purpose/Objective(s)Determine the potential role of LAP CBCT in Patient Positioning in Radiation Therapy. Determine the potential role of LAP CBCT in Patient Positioning in Radiation Therapy. Materials/MethodsLimited-angle Partial (LAP) conebeam CT (CBCT) has been developed to position patients with various treatment sites such as prostate with seed implants, lung, head and neck with titanium implants, sarcoma patients with lower and upper extremities, and breast patient with boost plan. The LAP CBCT was implemented with Elekta XVI (version 3.5) and Synery Linear Accelerator utilizing the following characteristics: S20 option (with two house-made smaller options), 200o scanning angels for breast, and 100o scanning angels for other sites. Various phantoms were fabricated to determine the optimum parameters of LAP CBCT in clinical applications. Limited-angle Partial (LAP) conebeam CT (CBCT) has been developed to position patients with various treatment sites such as prostate with seed implants, lung, head and neck with titanium implants, sarcoma patients with lower and upper extremities, and breast patient with boost plan. The LAP CBCT was implemented with Elekta XVI (version 3.5) and Synery Linear Accelerator utilizing the following characteristics: S20 option (with two house-made smaller options), 200o scanning angels for breast, and 100o scanning angels for other sites. Various phantoms were fabricated to determine the optimum parameters of LAP CBCT in clinical applications. ResultsFor breast, surgical clips were visible in three orthogonal planes even though the shape of the seroma was affected by other of parts of the patient body. The surgical clips were found to be migrated by 4-8 mm for 8 consecutive patients treated with 3D CFRT. The prostate patients with 4 seed implants, spinal SBRT, lung SBRT were involved to compare full CBCT with specific options for each treatment site (manufacturer-recommended option) and LAP CBCT. Geometrical differences between two techniques are 1-2 mm, which include the patient movements because of scanning time differences. For head and neck, with severe artifacts due to several implants, LAP CBCT introduces smaller artifacts for image fusion, even though the geometrical differences are on the order of inter-user- variations. For 3 sarcoma cases with setup of bent arms or thigh, patients' skin is distorted due to insufficient scanning angles, thus CT wires onto the skin or the immobilization devices are used to position the patient. TLDs are used to measure the dose to the skins. For breast, surgical clips were visible in three orthogonal planes even though the shape of the seroma was affected by other of parts of the patient body. The surgical clips were found to be migrated by 4-8 mm for 8 consecutive patients treated with 3D CFRT. The prostate patients with 4 seed implants, spinal SBRT, lung SBRT were involved to compare full CBCT with specific options for each treatment site (manufacturer-recommended option) and LAP CBCT. Geometrical differences between two techniques are 1-2 mm, which include the patient movements because of scanning time differences. For head and neck, with severe artifacts due to several implants, LAP CBCT introduces smaller artifacts for image fusion, even though the geometrical differences are on the order of inter-user- variations. For 3 sarcoma cases with setup of bent arms or thigh, patients' skin is distorted due to insufficient scanning angles, thus CT wires onto the skin or the immobilization devices are used to position the patient. TLDs are used to measure the dose to the skins. ConclusionsThe LAP CBCT is taken in shorter scanning time, and gives smaller doses to other part of radiation-sensitive organs, lens, thyroid, and testes. Geometrical distortions (aliasing artifacts) due to insufficient scanning angles should be considered to understand the limitation of the LAP CBCT. It reduces the treatment time, and patient motion compared with full CBCT. Also, we can treat patients without moving the table during radiation delivery. The LAP CBCT is taken in shorter scanning time, and gives smaller doses to other part of radiation-sensitive organs, lens, thyroid, and testes. Geometrical distortions (aliasing artifacts) due to insufficient scanning angles should be considered to understand the limitation of the LAP CBCT. It reduces the treatment time, and patient motion compared with full CBCT. Also, we can treat patients without moving the table during radiation delivery." @default.
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• W2083254775 date "2010-11-01" @default.
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• W2083254775 title "Preliminary Study and Clinical Application of Limited-angle Partial (LAP) Conebeam CT in Conventional Radiation Therapy" @default.
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