How patient off-centering impacts organ dose and image noise in pediatric head and thoracoabdominal CT
| العنوان: | How patient off-centering impacts organ dose and image noise in pediatric head and thoracoabdominal CT |
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| المؤلفون: | André Euler, Natalia Saltybaeva, Hatem Alkadhi |
| المساهمون: | University of Zurich, Euler, André |
| المصدر: | European Radiology. 29:6790-6793 |
| بيانات النشر: | Springer Science and Business Media LLC, 2019. |
| سنة النشر: | 2019 |
| مصطلحات موضوعية: | medicine.medical_specialty, 610 Medicine & health, Radiation Dosage, Patient Positioning, Imaging phantom, 030218 nuclear medicine & medical imaging, 03 medical and health sciences, 0302 clinical medicine, Image noise, medicine, 2741 Radiology, Nuclear Medicine and Imaging, Humans, Scattering, Radiation, Radiology, Nuclear Medicine and imaging, Neuroradiology, Dosimeter, 10042 Clinic for Diagnostic and Interventional Radiology, Phantoms, Imaging, business.industry, Ultrasound, Brain, Tumor Protein, Translationally-Controlled 1, Isocenter, General Medicine, Noise, Child, Preschool, 030220 oncology & carcinogenesis, Radiography, Thoracic, Body region, Radiology, Tomography, X-Ray Computed, business |
| الوصف: | To assess the impact of patient off-centering on organ dose and image noise for head and thoracoabdominal CT in a pediatric phantom. An anthropomorphic phantom simulating a 5-year-old child was used. Semiconductor dosimeters were placed in various cranial and thoracoabdominal organs. Head and thoracoabdominal CT were performed using automatic tube current modulation (ATCM) and default bowtie filters. The phantom was imaged repeatedly at vertical table positions ranging from − 6 to + 6 cm from the 0-position. Tube current time products (TCTP), organ doses, and image noise were recorded. Scatter radiation was measured in the thyroid for head CT. The effect of ATCM and bowtie filters was assessed. Depending on patient position, organ doses differed up to 22% for the supratentorial brain, 34% for the infratentorial brain, 19% for the eyes, 28% for the lungs, 25% for the stomach, and 22% for the liver compared with those in the 0-position. The relation between position and dose was linear and mainly affected by the bowtie filter in head CT, while it was quadratic and affected by ATCM and bowtie filter in thoracoabdominal CT. It further depended on the relative position of each organ to the isocenter. An inverse relation was found between position and image noise. Scatter radiation was not significantly related to patient positioning (p = 0.21). In pediatric CT, vertical patient positioning had a substantial impact on radiation dose with differences of up to 34%, depending on the body region and location of each individual organ. • Patient off-centering has a substantial impact on organ radiation dose and image noise in pediatric CT. • Impact of patient off-centering on radiation dose and noise differs between head and thoracoabdominal CT. • Differences are caused by both ATCM and bowtie filter in thoracoabdominal CT, but mainly by bowtie filter in head CT. |
| تدمد: | 1432-1084 0938-7994 |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::93f354210277ceb479c4c0d5fa54ed93Test https://doi.org/10.1007/s00330-019-06330-5Test |
| حقوق: | CLOSED |
| رقم الانضمام: | edsair.doi.dedup.....93f354210277ceb479c4c0d5fa54ed93 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 14321084 09387994 |
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