【摘 要】
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Purpose To compare spectral CT with high frequency ultrasound for the detection and diagnosis of papillary thyroid microcarcinomas(PTMCs).Materials and methods 31 patients with suspected PTMC underwen
【机 构】
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Department of Diagnostic Radiology,National Cancer Center/Cancer Hospital,Chinese Academy of Medical
【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 compare spectral CT with high frequency ultrasound for the detection and diagnosis of papillary thyroid microcarcinomas(PTMCs).Materials and methods 31 patients with suspected PTMC underwent contrast-enhanced CT with dual-energy spectral CT.CT images were divided into polychromatic images(group A)and monochromatic images(group B)and analyzed by two radiologists.Ultrasonography was performed by an experienced radiologist with a 7-to 12-MHz linear array transducer.Results 46 pathologically-confirmed PTMC lesions(mean size: 0.69±0.04 cm)were detected in 31 patients.The optimal contrastnoise-ratio(CNR)was achieved at 65.83±2.01keV for CT.More lesions were detected at high frequency ultrasound(45/46 [97.8%] than on polychromatic(40/46 [87.0%])or monochromatic(44/46 [95.7%])images.25(80.6%)patients had pathology-confirmed lymph node metastases involving 82 levels.Preoperative CTand ultrasound diagnosed lymph node metastasis at 67 and 63 levels respectively.The sensitivity and specificity of ultrasound and spectral CT to diagnose cervical lymph node metastasis were(76.8%and 99%)and(81.7%and 99.3%)respectively.There was no significant difference in the diagnostic accuracy obtained by spectral CT and ultrasound(p=0.125).Conclusion Spectral CT images were superior to polychromatic images and similar to frequency ultrasound in the detection ability and diagnostic accuracy.
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