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KMID : 1149020190210010011
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Journal of Korean Society of Computed Tomographic Technology
2019 Volume.21 No. 1 p.11 ~ p.18
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Evaluation of Usefulness of the Half Scan in CT Guided Interventional Radiology
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Park Jin-Seok
Kim Yung-Kyoon
Chang Kwang-Hyun
Nam Yoon-Chul
Ahn Mi-Sub
Yoon Joon
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Abstract
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Purpose: As the CT guided interventional radiology increase so does the exposure dose of patients and workers. The usefulness of half scan (HS) compared to full scan (FS) was assessed in terms of the exposure dose of patient and the image quality in CT guided interventional radiology.
Materials & Method: The patient dose of FS and HS were measured by using the PMMA acrylic phantom and ionization chambers in CT (Aquillon one genesis, Toshiba); the data was converted to CTDI vol . The predicted dose of HS and FS kept as 5.60 mGy by setting X-ray tube current as 120 mA and 180 mA for FS and HS, respectively. Spatial dose distribution of workers was measured at the left and right points 1.0-m from the center of the gantry using a lower-level radiation protection chamber which located 1.0-m above the ground. The image quality was evaluated from the CT number, noise, and uniformity of ACR phantom.
Result: The measured exposure dose of the full scan and the average of half scan were same as a 5.53 mGy. Discrepancy between the measured and the estimated dose was 0.07 mGy and did not show any significant difference (p>0.05). The spatial dose of workers in half scan at the opposite side of X-ray exposure is lower than that of full scan by 8.7-9.6% (p<0.05). The CT number of waters is closer to 0 HU in half scan than full scan. Noise of the full scan and the half scan were 24.03±0.50 HU and 22.15±0.54 HU, respectively. Also, the uniformity of the full scan and the half scan were -1.58±0.39 HU and 0.35±0.48 HU, respectively. The noise and uniformity in half scan were the average value of four directions.
Conclusion: In summary, the image quality of half scan is better than that of half scan. Also, the exposure dose of workers can be reduced by the selection of proper X-ray exposure direction; therefore, the half scan is useful technique in the CT guided interventional radiology.
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KEYWORD
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Half scan, Interventional CT, Radiation dose, Spatial dose, Image quality
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