Reduction of Radiation Exposure and Image Quality Using Dose Reduction Tool on Computed Tomography Fluoroscopy
| Autor: | Noriyuki Kai, Masahiro Hashida, Michiaki Ono, Kengo Nakato, Masaki Tokuda, Yoshinori Funama, Hiroo Murazaki, Daisuke Sakabe, Syuichi Tochihara |
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| Rok vydání: | 2012 |
| Předmět: |
Materials science
medicine.diagnostic_test Phantoms Imaging business.industry Image quality medicine.medical_treatment media_common.quotation_subject General Medicine Radiation Dosage Imaging phantom Fluoroscopy medicine Image noise Contrast (vision) Tomography Artifacts Tomography X-Ray Computed Nuclear medicine business Rotation (mathematics) Reduction (orthopedic surgery) media_common |
| Zdroj: | Japanese Journal of Radiological Technology. 68:970-978 |
| ISSN: | 1881-4883 0369-4305 |
| DOI: | 10.6009/jjrt.2012_jsrt_68.8.970 |
| Popis: | The purpose of our study was to measure the reduction rate of radiation dose and variability of image noise using the angular beam modulation (ABM) on computed tomography (CT) fluoroscopy. The Alderson-Rando phantom and the homemade phantom were used in our study. These phantoms were scanned at on-center and off-center positions at -12 cm along y-axis with and without ABM technique. Regarding the technique, the x-ray tube is turned off in a 100-degree angle sector at the center of 12 o'clock, 10 o'clock, and 2 o'clock positions during CT fluoroscopy. CT fluoroscopic images were obtained with tube voltages, 120 kV; tube current-time product per reconstructed image, 30 mAs; rotation time, 0.5 s/rot; slice thickness, 4.8 mm; and reconstruction kernel B30s in each scanning. After CT scanning, radiation exposure and image noise were measured and the image artifacts were evaluated with and without the technique. The reduction rate for radiation exposure was 75-80% with and without the technique at on-center position regardless of each angle position. In the case of the off-center position at -12 cm, the reduction rate was 50% with and without the technique. In contrast, image noise remained constant with and without the technique. Visual inspection for image artifacts almost have the same scores with and without the technique and no statistical significance was found in both techniques (p>0.05). ABM is an appropriate tool for reducing radiation exposure and maintaining image-noise and artifacts during CT fluoroscopy. |
| Databáze: | OpenAIRE |
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