Department of Radiology and the Research Institute of Radiological Science, Yonsei University College of Medicine, Gangnam Severance Hospital, Seoul 135-720, Korea.
Korean J Radiol. 2011 May-Jun;12(3):341-50. doi: 10.3348/kjr.2011.12.3.341. Epub 2011 Apr 25.
We wanted to validate the additional merit of the thinner coronal reformation images from multidetector CT (MDCT) for making the diagnosis of hepatic cysts.
For the 90 benign hepatic cysts confirmed on MRI, the transverse (5-mm thickness) and additional coronal (2-mm thickness) reformation images from MDCT were compared with each other in terms of the Hounsfield units (HUs) and the size of each hepatic cyst.
THE ATTENUATIONS (MEAN: 17.2 HUs, standard deviation: ± 14.4) on the thinner coronal images were significantly lower than those (mean: 40.7 HUs; standard deviation: ± 20.6) on the thicker transverse images for the small hepatic cysts (≤ 10 mm on the transverse image, p < 0.01). Twenty-three (79%) of the 29 cysts between 5 mm and 10 mm and 21 (51%) of 41 lesions up to 5 mm showed a mean HU value of 20 or less on the coronal reformation images.
By reducing the partial volume effect, routine coronal reformation of MDCT with a thinner section thickness can provide another merit for making a confidential diagnosis of many small sub-centimeter hepatic cysts, and these small cysts are not easily characterized on the conventional transverse images.
我们希望验证多层螺旋 CT（MDCT）更薄的冠状重建图像在诊断肝囊肿方面的额外优势。
对于 90 个经 MRI 证实的良性肝囊肿，将 MDCT 的横轴位（5mm 层厚）和附加冠状位（2mm 层厚）重建图像进行比较，比较内容包括各肝囊肿的 CT 值（Hounsfield 单位，HU）和大小。
对于小的肝囊肿（横轴位图像直径≤10mm），薄冠状位图像的衰减值（平均值：17.2HU，标准差：±14.4）明显低于厚横轴位图像的衰减值（平均值：40.7HU，标准差：±20.6）（p<0.01）。在 29 个 5-10mm 的囊肿中，有 23 个（79%），在 41 个直径≤5mm 的病灶中，有 21 个（51%）在冠状位重建图像上的平均 HU 值为 20 或更低。
通过减少部分容积效应，使用更薄的 MDCT 冠状位重建可以为许多小至亚厘米的肝囊肿的明确诊断提供额外的优势，这些小囊肿在常规横轴位图像上不易被识别。
