21-25 June 2021
Clarion Congress Hotel Prague
Europe/Prague timezone
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Computed tomography measured by a low-noise current-sensitive preamplifier VIEC

Not scheduled
3rd floor (Clarion Congress Hotel Prague)

3rd floor

Clarion Congress Hotel Prague

Freyova 945/33, 190 00 Prague 9 - Vysočany
Oral presentation 09 Environmental and Medical Sciences


KANNO, Ikuo (Graduate School of Engineering, Kyoto University)


X-ray computed tomography (CT) is a useful modality to observe tumors. In hospitals, X-rays are measured as electric current with using current-sensitive preamplifiers (PAs). The current-sensitive PA converts electric current induced in a detector by the X-rays into voltage. A dark current, which is a noise of a detector, is also converted to voltage and gives bad influence on the measured voltage signal. For avoiding the effect of the detector noise, many X-rays are necessary for a proper CT measurement.
We developed a low-noise current-sensitive PA called VIEC, with using a charge-sensitive PA without a feedback resistance. This charge-sensitive PA requires an active reset of a feedback capacitance when it is fully charged. With this charge-sensitive PA, the electric current induced by X-rays can be estimated by measuring the time period between two resets.
We reported that the VIEC is 750 times sensitive to electric current than the conventional current-sensitive PA. In this paper, we compare the CT images obtained by the conventional current-sensitive PA and by the VIEC.

Primary authors

KANNO, Ikuo (Graduate School of Engineering, Kyoto University) Mr NISHIKAWA, Junichiro (Kyoto University) Mr ONABE, Hideaki (Raytech Corporation)

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