【摘 要】
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Purpose To discuss the image quality and dose reduction in temporal bone HRCT scanning with iterative algorithm and lowdose.Methods 60 adult patients (body weight 50~90 kg) supposed to undergo tempora
【出 处】
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中华放射学学术大会2016、中华医学会第23次全国放射学学术大会暨中华医学会第24次全国影像技术学术大会
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Purpose To discuss the image quality and dose reduction in temporal bone HRCT scanning with iterative algorithm and lowdose.Methods 60 adult patients (body weight 50~90 kg) supposed to undergo temporal bone HRCT were selected and randomly divided into 3 groups:A (120kV, 200mAs),the images were reconstructed with FBP; B (100kV, 200mAs) was done with iDose4; C (100kV, 100mAs) was done with IMR.The values [ CT value noise (SD), contrast-to- noise ratio (CNR) and signal-to- noise ratio (SNR)] of three groups were measured and compared.The image quality was evaluated subjectively by radiologists at double blinded.Result The CT value, SD value, CNR, SNR and subjective score of three groups were statistically significant (P<0.05).The CT values, SD values, CNR and SNR from the Group B were higher than the Group A and the subjective scores was lower; Excepting the CT value, the other items were no statistically significant (P>0.05).The CT value, CNR, SNR and the subjective score from Group C were higher than A and B, and the SD value was lower ; All the five parameters (CT value, SD value, CNR, SNR and the subjective score)from the group C were statistically significant (P<0.05) to the rest groups.The effective radiation dose(ED) of three groups was 7.2,4.4 and 2.2mSv respectively; Compared with Group A, the ED from B and C were 38.89% and 69.44% lower respectively.Compared with Group B, the ED of C was 50.00% lower.Conclusion The image quality was still ensured in the temporal bone HRCT scanning with IR algorithm(iDose4 and IMR) and lowdose, while the ED was dramatically reduced.The IMR algorithm is better than iDose4.
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