This paper provides a method of positioning the ultrasound probe in MR system. Machining 6 slots or cylinder perpendicular to the ultrasound probe surface on the edge of ultrasound probe as markers, 12 central cylinder ends are chosen as positioning points. By calculating these positioning points' coordinates in MR's coordinate system, the coordinate transformation between the ultrasound and MR coordinate system can be computed. Furthermore, by taking advantage of redundant information, calculating errors can be reduced and the precision can be improved.
Magnetic Resonance Imaging ; Ultrasonic Therapy ; methods

Objective To understand the effect of mindfulness-based stress reduction(MBSR)on death anxiety and job burnout in Intensive Care Unit(ICU) nurses. Methods Using cluster sampling method, ICU nurses from two ClassⅢ Grade A hospitals in Dazhou city of Sichuan Province were selected as the research objects. In order to avoid mutual influence, nurses were divided into groups according to hospitals. Totally 32 ICU nurses in one hospital were set as the control group and 38 ICU nurses in another hospital as the observation group. During the course of the study, one nurse in the observation group quit the study due to personal reasons, and 37 nurses finally completed the study. The nurses in the control group did not receive any intervention, while the nurses in the observation group were adopted the MBSR intervention. The intervention effect was evaluated by the Chinese Version of Templer-death Anxiety Scale(CT-DAS) and Job Burnout Scale. Results There was no statistically significant difference between the two groups before intervention in terms of their Death Anxiety Scale score (P＞0.05); the score in Death Anxiety Scale in the observation group was lower than the control group after intervention and the difference was statistically significant (P＜ 0.05). Before the intervention, there was no statistically significant difference in the total score and the scores of each dimension of Job Burnout Scale between the two groups (P＞0.05); after intervention, the total score of Job Burnout Scale and the score of "emotional fatigue" in the observation group were lower than those in the control group with statistical significances (P＜0.05). There was no statistically significant difference between the two groups in the scores of indifference to work and personal lacking in sense of achievement between the two groups(P＞0.05). Conclusions MBSR therapy can reduce the death anxiety level and job burnout of ICU nurses.