Search

Your search keyword '"C‐RAD CatalystHD"' showing total 2 results
Start Over Descriptor "C‐RAD CatalystHD"
2 results on '"C‐RAD CatalystHD"'

1. Comparison of initial patient setup accuracy between surface imaging and three point localization: A retrospective analysis

Author

Nikos Papanikolaou, Alonso N. Gutierrez, Kristen A. McConnell, Neil Kirby, Dennis N. Stanley, and Karl Rasmussen

Subjects
medicine.medical_specialty, Cone beam computed tomography, Wilcoxon signed-rank test, 87.55.Gh, 87.55.Qr, 87.56.Da, Radiotherapy Setup Errors, Patient Positioning, 030218 nuclear medicine & medical imaging, 03 medical and health sciences, Point localization, 0302 clinical medicine, surface imaging, Neoplasms, 87.63.l, 83.85.Ei, medicine, Retrospective analysis, Humans, Radiation Oncology Physics, Radiology, Nuclear Medicine and imaging, 87.63.-D, Radiometry, Instrumentation, Pelvis, Retrospective Studies, Radiation, business.industry, Radiotherapy Planning, Computer-Assisted, 87.55.km, Surface Guided Radiation Therapy, SGRT, Radiotherapy Dosage, Cone-Beam Computed Tomography, subcutaneous tattoos, patient setup, Surgery, medicine.anatomical_structure, 030220 oncology & carcinogenesis, Abdomen, Radiotherapy, Intensity-Modulated, C‐RAD CatalystHD, Nuclear medicine, business
Abstract

Purpose Historically, the process of positioning a patient prior to imaging verification used a set of permanent patient marks, or tattoos, placed subcutaneously. After aligning to these tattoos, plan specific shifts are applied and the position is verified with imaging, such as cone-beam computed tomography (CBCT). Due to a variety of factors, these marks may deviate from the desired position or it may be hard to align the patient to these marks. Surface-based imaging systems are an alternative method of verifying initial positioning with the entire skin surface instead of tattoos. The aim of this study was to retrospectively compare the CBCT-based 3D corrections of patients initially positioned with tattoos against those positioned with the C-RAD CatalystHD surface imager system. Methods A total of 6000 individual fractions (600–900 per site per method) were randomly selected and the post-CBCT 3D corrections were calculated and recorded. For both positioning methods, four common treatment site combinations were evaluated: pelvis/lower extremities, abdomen, chest/upper extremities, and breast. Statistical differences were evaluated using a paired sample Wilcoxon signed-rank test with significance level of

Published
2017

2. Comparison of initial patient setup accuracy between surface imaging and three point localization: A retrospective analysis.

Author

Stanley DN, McConnell KA, Kirby N, Gutiérrez AN, Papanikolaou N, and Rasmussen K

Subjects
Humans, Radiometry methods, Radiotherapy Dosage, Radiotherapy, Intensity-Modulated methods, Retrospective Studies, Cone-Beam Computed Tomography methods, Neoplasms diagnostic imaging, Neoplasms radiotherapy, Patient Positioning, Radiotherapy Planning, Computer-Assisted methods, Radiotherapy Setup Errors prevention & control
Abstract

Purpose: Historically, the process of positioning a patient prior to imaging verification used a set of permanent patient marks, or tattoos, placed subcutaneously. After aligning to these tattoos, plan specific shifts are applied and the position is verified with imaging, such as cone-beam computed tomography (CBCT). Due to a variety of factors, these marks may deviate from the desired position or it may be hard to align the patient to these marks. Surface-based imaging systems are an alternative method of verifying initial positioning with the entire skin surface instead of tattoos. The aim of this study was to retrospectively compare the CBCT-based 3D corrections of patients initially positioned with tattoos against those positioned with the C-RAD CatalystHD surface imager system., Methods: A total of 6000 individual fractions (600-900 per site per method) were randomly selected and the post-CBCT 3D corrections were calculated and recorded. For both positioning methods, four common treatment site combinations were evaluated: pelvis/lower extremities, abdomen, chest/upper extremities, and breast. Statistical differences were evaluated using a paired sample Wilcoxon signed-rank test with significance level of <0.01., Results: The average magnitudes of the 3D shift vectors for tattoos were 0.9 ± 0.4 cm, 1.0 ± 0.5 cm, 0.9 ± 0.6 cm and 1.4 ± 0.7 cm for the pelvis/lower extremities, abdomen, chest/upper extremities and breast, respectively. For the CatalystHD, the average magnitude of the 3D shifts for the pelvis/lower extremities, abdomen, chest/upper extremities and breast were 0.6 ± 0.3 cm, 0.5 ± 0.3 cm, 0.5 ± 0.3 cm and 0.6 ± 0.2 cm, respectively. Statistically significant differences (P < 0.01) in the 3D shift vectors were found for all four sites., Conclusion: This study shows that the overall 3D shift corrections for patients initially aligned with the C-RAD CatalystHD were significantly smaller than those aligned with subcutaneous tattoos. Surface imaging systems can be considered a viable option for initial patient setup and may be preferable to permanent marks for specific clinics and patients., (© 2017 The Authors. Journal of Applied Clinical Medical Physics published by Wiley Periodicals, Inc. on behalf of American Association of Physicists in Medicine.)

Published
2017
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results