Evaluation of the relationship between phantom position and computed tomography dose index in cone beam computed tomography when assuming breast irradiation
| Autor: | Kosuke Matsubara, Masato Hizume, Akihiro Takemura, Sayuri Bou, Hiroyuki Ueno |
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| Rok vydání: | 2021 |
| Předmět: |
Cone beam computed tomography
image‐guided radiation therapy medicine.medical_treatment Computed tomography dose index Imaging phantom 030218 nuclear medicine & medical imaging 03 medical and health sciences 0302 clinical medicine stomatognathic system Position (vector) Technical Note medicine Humans Radiology Nuclear Medicine and imaging Irradiation Instrumentation Image-guided radiation therapy Physics Radiation Phantoms Imaging business.industry X-Rays Isocenter Radiotherapy Dosage cone beam computed tomography Cone-Beam Computed Tomography equipment and supplies Radiation therapy 030220 oncology & carcinogenesis Technical Notes computed tomography dose index Nuclear medicine business Radiotherapy Image-Guided |
| Zdroj: | Journal of Applied Clinical Medical Physics |
| ISSN: | 1526-9914 |
| DOI: | 10.1002/acm2.13282 |
| Popis: | This study aims to investigate the influence of the phantom position on weighted computed tomography dose index (CTDIw) in cone beam computed tomography (CBCT) when assuming breast irradiation. Computed tomography dose index (CTDI) was measured by the x‐ray volume imaging of CBCT using parameters for image‐guided radiation therapy (IGRT) in right breast irradiation. The measurement points of CTDI ranged from 0 (center) to 16 cm in the right–left (RL) direction, and from 0 (center) to 7.5 cm in the anterior–posterior (AP) direction, which assumed right breast irradiation. A nonuniform change exists in the relative value of CTDIw when the phantom deviated from the isocenter of CBCT. The CTDIw was ~30% lower compared with the value at the isocenter of CBCT when the phantom deviated 7.5 and 16 cm at the AP and RL directions, respectively. This study confirmed the influence of the phantom position on the CTDI values of CBCT. The CTDI measured at the isocenter of CBCT overestimates that measured at the irradiation center of the breast. |
| Databáze: | OpenAIRE |
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