PHANTOM STUDY OF THE ENTRANCE SURFACE DOSE OF A NEW CT SCOUT ACQUISITION THAT ALSO SERVES AS A TUBE WARM-UP

Abstract We determined the effect of a new scout image acquisition technique (‘smart scout’), which also serves as a tube warm-up, on radiation dose and automatic exposure control (AEC) mA settings. The entrance surface dose (ESD) of a chest phantom with and without the smart scout was measured. A c...

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Bibliographic Details
Published in:Radiation protection dosimetry 2022-05, Vol.198 (6), p.334-338
Main Authors: Ota, Joji, Yokota, Hajime, Higashida, Reona, Komiya, Ryota, Kawakami, Yuya, Chida, Koichi, Masuda, Yoshitada, Uno, Takashi
Format: Article
Language:English
Subjects:
Abdomen
Phantoms, Imaging
Radiation Dosage
Thorax
Tomography, X-Ray Computed - methods
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Summary:Abstract We determined the effect of a new scout image acquisition technique (‘smart scout’), which also serves as a tube warm-up, on radiation dose and automatic exposure control (AEC) mA settings. The entrance surface dose (ESD) of a chest phantom with and without the smart scout was measured. A conical AEC phantom was scanned in the setting for abdominal CT, and AEC curves were generated. ESD when the smart scout was not used was 0.75 mGy at 120 kV, 50 mA. ESD when using the smart scout was 0.24 mGy for a body habitus setting of ‘Less’, 0.54 mGy for ‘Moderate’ and 0.95 mGy for ‘More’. When the diameter of the subject was ≥32 cm, the mA setting became lower in ‘Less’. The smart scout reduced exposure at the ‘Less’ and Moderate’ settings compared to the conventional scout scan.
ISSN:0144-8420
1742-3406
DOI:10.1093/rpd/ncac057