Department of Radiology, Jeonbuk National University Medical School, Jeonju, Republic of Korea.
Department of Radiology, Pusan National University Hospital, Biomedical Research Institute, Pusan, Republic of Korea.
Br J Radiol. 2022 Jan 1;95(1129):20210990. doi: 10.1259/bjr.20210990. Epub 2021 Nov 16.
To accurately differentiate clumpy artifacts from tophi with foot and ankle DECT.
In session 1, 108 clumpy artifacts from 35 patients and 130 tophi images from 25 patients were analyzed. Reviewers classified green pixelation according to anatomic location, shape (linear, stippled, angular, oval), and height and width ratio. In session 2, green pixelation confined to the tendon was evaluated (shape, height and width ratio, occupied area in the tendon, accompanied peritendinous green pixelation).
In session 1, while tophi were noted at various locations, almost all clumpy artifacts were located at the tendon (99%, < 0.0001). Most clumpy artifacts were linear, stippled, and wide, while most tophi were angular and oval ( < 0.05). In session 2, the shape of green pixelation from clumpy artifacts and tophi was significantly different ( < 0.0001) and most clumpy artifacts occupied less than 50% of the tendon ( = 0.02), and most tophi were accompanied by peritendinous green pixelation ( < 0.0001). Univariant logistic regression showed that tophi were significantly correlated with peritendinous deposits, angular and oval shape, and more than 50% of the tendon ( < 0.05).
Clumpy artifacts can be differentiated from tophi in DECT. Clumpy artifacts typically are located in the tendon with a linear or stippled shape, wide, and less than 50% of a tendon's cross-section. Tophi, on the other hand, typically are oval, larger than 50% of the tendon's cross-section, and associated with adjacent peritendinous green pixelation.
Clumpy artifacts can be differentiated from tophi in image findings by their location and shape.
利用足踝部 DECT 准确区分团块状伪影与痛风石。
在第 1 次会议中，分析了 35 名患者的 108 个团块状伪影和 25 名患者的 130 个痛风石图像。评估者根据解剖位置、形状（线性、点状、角状、椭圆形）以及高度与宽度比对绿色像素进行分类。在第 2 次会议中，评估了局限于肌腱的绿色像素（形状、高度与宽度比、肌腱内所占面积、伴发肌腱周围绿色像素）。
在第 1 次会议中，尽管痛风石见于不同部位，但几乎所有团块状伪影均位于肌腱（99%，<0.0001）。大多数团块状伪影为线性、点状和宽的，而大多数痛风石为角状和椭圆形（<0.05）。在第 2 次会议中，团块状伪影和痛风石的绿色像素形状有显著差异（<0.0001），大多数团块状伪影占据肌腱不到 50%（=0.02），且大多数痛风石伴发肌腱周围绿色像素（<0.0001）。单变量逻辑回归显示，痛风石与肌腱周围沉积物、角状和椭圆形以及超过 50%的肌腱有显著相关性（<0.05）。
DECT 可区分团块状伪影与痛风石。团块状伪影通常位于肌腱内，呈线性或点状，较宽，小于肌腱横截面积的 50%。而痛风石通常呈椭圆形，大于肌腱横截面积的 50%，并伴发相邻肌腱周围绿色像素。
根据位置和形状，可在影像学发现中区分团块状伪影与痛风石。
