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The study was conducted from July 5th to 12th, 2014 on 30 males and females. The examination device used for this study were Discovery XR656(GE Healthcare, Kemath, Germany) DR and SOMATOM definition AS+ CT. T he device was made of foamex (foam PVC). The posture for cubital tunnel view examination requires for patients to bend their elbows more than 60 degrees and turn their forearms 20 degrees externally. The analysis method of cubital tunnel depth(CTD) was to measure the length between the deepest location of groove for ulnar nerve and a line vertical to the line connecting protruding part of medial epicondyle and trochlea medial in order to measure the CTD with and without the assistance device. CTD were measured and compared from VRT images on CT examination of 30 males and females to prove the usability of the assistance device. For statistics, SPSS 18.0 version was used to conduct independent two samples t-test. Differences in CTD between the two sexes were nonexistent but, the differences in CTD according to the use of assistance device were 4.63±0.86mm in temporizing measure, and 6.01±0.27mm with the assistance device for male. For females, the results were 4.58±0.41mm in temporizing measure and 5.94±0.58mm with the assistance device. The results proved that the measured values of CTD are deeper with the use of assistance device. The difference between CTD value from CT of normal person and CTD level measured with X-ray using the assistance device were nonexistent. P<0.05) Use of an assistance device made more accurate and convenient examinations possible compared to examinations without any assistance devices. Use of the assistance device in this study in radiological examinations on Cubital Tunnel Syndrome would provide more accurate and convenient examinations in the future.