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KMID : 1149020170190020007
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Journal of Korean Society of Computed Tomographic Technology
2017 Volume.19 No. 2 p.7 ~ p.16
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The Usefulness of CAD in low-dose Chest CT When Isocenter is Inconsistent
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Kang Seon-Young
Lee Jun-Hyub
Kim Hyeong-Cheol
Lee Yun-Sang
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Abstract
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Purpose : The purpose of this study is to evaluate the usefulness of CAD in detection of nodules in the case of gantry aperture isocenter and object center discrepancy at low dose in the lung area of Computer-Aided Diagnosis.
Materials and Methods : Five solid nodules with diameters of 3, 5, 8, 10, and 12 mm were placed in the left lung and Five GGO nodules with diameters of 5, 8, 8, 10, and 12 mm were placed in the right lung without alignment. Lungman was inspected in agreement with the isocenter of the gantry aperture and the Lungman was moved 30, 60 and 90 mm in the X or Y direction. After that, estimated CT number, noise and SNR of the lung according to the position change. 20 solid nodules of uniform size and material 8 mm in diameter were placed in the Lungman phantom without alignment. Lungman was inspected in agreement with the isocenter of the gantry aperture and the Lungman was moved 30, 60 and 90 mm in the X or Y direction. After that, the reproducibility of multiple nodules was evaluated.
Results : 1. As Lungman moved away from the isocenter of the Gantry aperture away from the X-axis or Y-axis, CT Number and noise increased, and SNR decreased 2. The solid nodules were identified as 5, 8, 10, and 12 mm in diameter, and the GGO nodules were all of the same number irrespective of whether the 10 and 12 mm diameter nodules moved the center of the LungMan to the X-axis or Y-axis. 3. 20 solid nodules of uniform size and material, 8 mm in diameter, were detected in all three experimental changes without a defined arrangement, regardless of whether the LungMan was moved to the X-axis or the Y-axis.
Conclusions : The CAD program can be a helpful diagnostic tool because of its excellent reproducibility of detection of 8 mm solid nodule under pool image quality conditions of low dose and isocenter inconsistency.
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KEYWORD
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Low-dose Chest CT, Isocenter, Solid nodule, Lungman, CAD
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