A novel method for CT dosimetry with a suspended phantom setup |
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| Affiliation: | 1. Medical Physics Unit, Bambino Gesù Children’s Hospital, IRCCS, Rome, Italy;2. Department of Medical Physics, ULSS8, Vicenza, Italy;3. Department of Diagnostic Imaging, Bambino Gesù Children’s Hospital, IRCCS, Rome, Italy;1. Department of Radiology, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo, 160-8582, Japan;2. Research Park, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo, 160-8582, Japan;3. Department of Radiological Technology, Keio University Hospital, 35 Shinanomachi, Shinjuku-ku, Tokyo, 160-8582, Japan;4. Department of Radiology, Toho University Medical Center Omori Hospital, 6-11-1 Omori-nishi, Ota-ku, Tokyo, 143-8541, Japan;1. Department of Radiology, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China;2. Healthcare Sector, Siemens Limited China, Shanghai, China;3. Healthcare Sector, Siemens AG, Forchheim, Germany;1. Department of Radiotherapy and Radiation Oncology, Saarland University Medical Center, Kirrberger Str. Geb. 6.5, D-66421 Homburg/Saar, Germany;2. Department of Diagnostic and Interventional Radiology, Saarland University Medical Center, Kirrberger Str. Geb. 50.1, D-66421 Homburg/Saar, Germany;1. Department of Physics, University of Pisa and INFN, sezione di Pisa, Italy;2. INFN, sezione di Torino, Italy;3. Department of Physics, University of Torino, Italy;1. St George''s Hospital NHS Foundation Trust and Medical School, London, UK;2. Medical (Radiation) Dosimetry Group, Centre for Radiation, Chemical and Environmental Hazards (CRCE), Public Health England, Chilton, UK;1. Dept of Medical Physics, Aarhus University/Aarhus University Hospital, Aarhus, Denmark;2. Servei de Radiofísica i Radioprotecció, Hospital Sant Pau, Barcelona, Spain;3. Dept of Radiation Oncology, Division of Medical Radiation Physics, Medical University of Vienna/AKH Vienna, Vienna, Austria;4. Medical Physics, Institut Sainte Catherine, Avignon, France;5. Institute of Medical Physics, School of Physics, University of Sydney, Sydney, Australia |
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| Abstract: | PurposeThis work presents a method for estimating CT dosimetric indices with a prototype designed for suspending the phantom/ion chamber system fixed at the CT isocenter. The purpose of this study was to validate the proposed methodology, which can be used to provide a direct assessment of dosimetric indices in helical scans.MethodsThe method is based on a reference setup in which the measuring system for CT dosimetry is in a stationary configuration, i.e. not bound to the CT table, and on a mathematical formalism developed for the proposed reference system. The reliability of the method was demonstrated through a set of experimental measurements. Firstly, dosimetric indices were measured with the new method and compared with the indices obtained with the procedure currently used for CT dosimetry (measuring system bound to the CT table). Secondly, dosimetric indices measured with the new method were compared with those displayed on the CT console.ResultsThere is good agreement between the dosimetric indices obtained with the standard setup and those obtained with the suspended phantom setup, within the expected range of errors. The difference between dosimetric indices estimated with the proposed method and those displayed on the CT console is below 2%.ConclusionsThe method enables CT dosimetry to be performed with the dose detector in a stationary longitudinal position thanks to the newly introduced suspended phantom setup. Using this approach, CT dose can be assessed for high pitch helical scans, acquisitions without complete tube rotation and for cases where dynamic collimation is used. |
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| Keywords: | Computed Tomography Dosimetric indices Dose Length Product CT dose phantoms |
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