Will they fit? Development of a measurement device to assess body habitus compatibility with MRI bore diameter for emergency trauma imaging
Will they fit? Development of a measurement device to assess body habitus compatibility with MRI bore diameter for emergency trauma imaging
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DOI：
10.1007/s10140-011-1010-3
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发表时间：
2012-04-01
影响因子：
2.2
通讯作者：
Napolitano, Lena M.
中科院分区：
文献类型：
--
作者：
Corwin, Amanda;Aresty, Adam;Napolitano, Lena M.
过度肥胖对放射性磁共振成像（MRI）造成显著限制，特别是由于患者的腰围而与孔径或孔径有关。目前，使用患者身高、体重和MRI技术人员经验来确定患者是否适合MRI扫描仪的孔。这些简单的方法已被证明是不可靠的。我们试图开发一种设备和方法，可以准确地确定患者是否适合MRI扫描仪。我们开发了一个MRI模板原型，并在一项初步研究（n=6）中对标准放射学方法进行了测试。然后，我们在成人志愿者（n=100）中进行了前瞻性验证研究，以评估MRI模板的准确性。我们收集了每名研究参与者的身高、体重、肩部和骨盆周长/直径，以评价有助于确定患者是否适合MRI扫描仪的身体尺寸测量值。使用MRI模板，我们确定100名研究参与者中有11名无法放入MRI扫描仪，10名被确认无法放入MRI孔径[阳性预测值（PPV）0.91（0.580.99）;阴性预测值（NPV）1.00（0.95-1.00），灵敏度1.00（0.69-1.00），特异性0.99（0.93-0.99），似然比阳性测试90（12.81-632），似然比阴性测试0，准确性99%]。相比之下，身体测量方法表现不佳[PPV 0.66（0.34-0.90），净现值0.97（0.92-0.99），灵敏度0.80（0.440.97），特异性0.95（0.89-0.98），阳性似然比检验17.97（6.56-49.2），阴性似然比检验0.209（0.06-0.72），准确性94%]。本研究证实，使用MRI模板是确定肥胖患者是否适合通过MRI孔并容纳在MRI扫描仪中的准确工具。
Excessive obesity poses a significant limitation to radiographic magnetic resonance imaging (MRI), particularly related to aperture or bore diameter due to the patient's girth. Determination of whether a patient will fit into the bore of the MRI scanner is currently accomplished using patient height, weight, and MRI technician experience. These simple methods have proven unreliable. We sought to develop a device and method which could accurately determine whether a patient would fit into the MRI scanner. We developed an MRI template prototype which was tested against the standard radiology methods in a pilot study (n=6). We then performed a prospective validation study in adult human volunteers (n=100) to assess the accuracy of the MRI template. We collected height, weight, shoulder and pelvis girth/diameter for each study participant to evaluate the body dimension measurements that would assist in determination of whether a patient would fit into the MRI scanner. Using the MRI template, we determined that 11 of the 100 study participants would not fit in the MRI scanner and 10 were confirmed to not fit into the MRI aperture [positive predictive value (PPV) 0.91 (0.580.99); negative predictive value (NPV) 1.00 (0.95-1.00), sensitivity 1.00 (0.69-1.00), specificity 0.99 (0.93-0.99), likelihood ratio positive test 90 (12.81-632), likelihood ratio negative test 0, accuracy 99%]. In comparison, the body measurement method did not perform as well [PPV 0.66 (0.34-0.90), NPV 0.97 (0.92-0.99), sensitivity 0.80 (0.440.97), specificity 0.95 (0.89-0.98), likelihood ratio positive test 17.97 (6.56-49.2), likelihood ratio negative test 0.209 (0.06-0.72), accuracy 94%]. This study confirmed that the use of an MRI template is an accurate tool in determining whether an obese patient can fit through the MRI bore and be accommodated in the MRI scanner.