Ai Songtao, Qu Mingliang, Glazebrook Katrina N, Liu Yu, Rhee Peter C, Leng Shuai, McCollough Cynthia H
Department of Radiology, Mayo Clinic, 200 First Street SW, Rochester, MN, 55905, USA.
Skeletal Radiol. 2014 Sep;43(9):1289-95. doi: 10.1007/s00256-014-1913-7. Epub 2014 Jun 10.
The purpose of this study was to determine the ability of dual-energy computed tomography (DECT) and virtual non-calcium (VNCa) imaging to detect magnetic resonance imaging (MRI)-demonstrated bone bruises several weeks after unilateral knee injury.
Patients with unilateral knee injury and MRI-confirmed bone bruises who had undergone a DECT scan of both knees were retrospectively identified. Two radiologists evaluated VNCa images for bruises in four regions per knee without knowing the MRI results. The mean CT numbers were calculated for the lesion-positive and lesion-negative regions of the injured knee, and the contralateral knee.
Fourteen patients with a total of 36 regions positive for bone bruises on MRI were identified. The median delay between injury and DECT was 37 days (range, 11-99 days). The mean CT numbers in VNCa images for lesion-positive and lesion-negative regions were -7.6 ± 24.9 HU and -58.2 ± 19.5 HU, respectively. There were no significant differences in mean CT number between the lesion-negative regions in the injured knee and the contralateral knee. No resolution of bruising was seen before week 5, and bone bruising was still identifiable in one out of the two patients scanned at 10 weeks following injury.
DECT and VNCa images can identify bone bruising for at least 10 weeks after injury.
本研究旨在确定双能计算机断层扫描（DECT）和虚拟去钙（VNCa）成像检测单侧膝关节损伤数周后磁共振成像（MRI）显示的骨挫伤的能力。
回顾性纳入单侧膝关节损伤且MRI证实有骨挫伤并接受双侧膝关节DECT扫描的患者。两名放射科医生在不知道MRI结果的情况下评估每个膝关节四个区域的VNCa图像是否存在挫伤。计算受伤膝关节和对侧膝关节病变阳性和病变阴性区域的平均CT值。
确定了14例患者，其MRI上共有36个区域骨挫伤呈阳性。损伤与DECT之间的中位间隔时间为37天（范围11 - 99天）。VNCa图像中病变阳性和病变阴性区域的平均CT值分别为-7.6±24.9 HU和-58.2±19.5 HU。受伤膝关节病变阴性区域与对侧膝关节的平均CT值无显著差异。在第5周前未见挫伤消退，在损伤后10周扫描的两名患者中，有一名患者的骨挫伤仍可识别。
DECT和VNCa图像可在损伤后至少10周识别骨挫伤。
