Triple-sensitivity X-ray computed tomography using analog and digital amplifiers
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- YOSHIDA Sohei
- Department of Radiology, School of Medicine, Iwate Medical University
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- SATO Eiichi
- Department of Physics, Iwate Medical University
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- ODA Yasuyuki
- Department of Physics, Iwate Medical University
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- YOSHIOKA Kunihiro
- Department of Radiology, School of Medicine, Iwate Medical University
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- MORIYAMA Hodaka
- Department of Surgery, Toho University Ohashi Medical Center
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- WATANABE Manabu
- Department of Surgery, Toho University Ohashi Medical Center
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Abstract
<p>To reconstruct three-energy tomograms simultaneously, we constructed a triple-sensitivity X-ray computed tomography (TS-CT) scanner to observe gradual variations in image contrast. The TS-CT scanner is a first-generation type using a room-temperature cadmium telluride (CdTe) detector with one analog and two digital amplifiers. Using a line beam,CT is performed by repeating the translation using the CdTe detector and rotation using a turntable. The CdTe detector,with a specific gravity of 5.85, is highly sensitive to X rays and detects photons penetrating an object using a 0.25-mm diameter lead pinhole for improving the spatial resolution. Without photon counting, the currents flowing through the CdTe diode are converted into voltages using a current-to-voltage amplifier and amplified by a voltage-to-voltage amplifier. The effective photon energy increased with increasing digital amplification factor at a constant maximum output of 5.06 V owing to the beam hardening by the object. In the TS-CT, the tube voltage and current were regulated as 100 kV and 1.0 mA, respectively. The spatial resolutions and scanning time for CT were approximately 0.25×0.25 mm2 and 19.6 min,respectively. Using gadolinium contrast media, the image contrast of the media varied substantially according to changes in the digital amplification factor, and blood vessels were observed at a high contrast. The digital amplifier could be used instead of a real analog amplifier at low amplification factors below 3.0.</p>
Journal
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- Medical Imaging and Information Sciences
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Medical Imaging and Information Sciences 38 (1), 8-14, 2021-03-29
MEDICAL IMAGING AND INFORMATION SCIENCES
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Details 詳細情報について
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- CRID
- 1390850475731935872
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- NII Article ID
- 130008006409
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- ISSN
- 18804977
- 09101543
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- Text Lang
- en
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- Data Source
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- JaLC
- CiNii Articles
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- Abstract License Flag
- Disallowed