Powell Rachael, Ahmad Mahadir, Gilbert Fiona J, Brian David, Johnston Marie
School of Psychological Sciences & Manchester Centre for Health Psychology, University of Manchester, UK.
Health Psychology Program, Faculty of Health Sciences, The National University of Malaysia, Kuala Lumpur, Malaysia.
Br J Health Psychol. 2015 Sep;20(3):449-65. doi: 10.1111/bjhp.12132. Epub 2015 Feb 2.
The movement of patients in magnetic resonance imaging (MRI) scanners results in motion artefacts which impair image quality. Non-completion of scans leads to delay in diagnosis and increased costs. This study aimed to develop and evaluate an intervention to enable patients to stay still in MRI scanners (reducing motion artefacts) and to enhance scan completion. Successful scan outcome was deemed to be completing the scan with no motion artefacts.
Previous research indicated self-efficacy to predict successful scan outcome, and interviews with patients identified a need for procedural and sensory information to facilitate successful scan behaviour. A DVD intervention was developed which targeted self-efficacy and included procedural and sensory information. It was successfully piloted with 10 patients and then evaluated in a randomized controlled trial compared with the standard hospital information leaflet (intervention group N = 41; control group N = 42). The clinic radiographer, who was blind to group allocation, rated MRI scans for motion artefact and recorded whether the participant completed the scan; participants completed MRI self-efficacy and anxiety measures.
Only one participant reported not finding the DVD useful. Thirty-five participants in the intervention group and 23 in the control group completed scans and had no motion artefacts, χ(2) (1, 83) = 7.84, p < .001 (relative risk of an unsatisfactory outcome in the control group/intervention group = 3.09). The intervention effect was mediated by self-efficacy.
The DVD intervention was efficacious and warrants further research to examine generalizability.
患者在磁共振成像（MRI）扫描仪内的移动会导致运动伪影，从而损害图像质量。扫描未完成会导致诊断延迟和成本增加。本研究旨在开发并评估一种干预措施，以使患者在MRI扫描仪内保持静止（减少运动伪影）并提高扫描完成率。成功的扫描结果被视为完成扫描且无运动伪影。
先前的研究表明自我效能感可预测扫描结果是否成功，对患者的访谈确定需要程序和感官信息以促进成功的扫描行为。开发了一种针对自我效能感的DVD干预措施，其中包括程序和感官信息。该措施在10名患者中成功进行了试点，然后在一项随机对照试验中与标准医院信息手册进行了比较（干预组N = 41；对照组N = 42）。对分组不知情的临床放射技师对MRI扫描的运动伪影进行评级，并记录参与者是否完成扫描；参与者完成了MRI自我效能感和焦虑测量。
只有一名参与者报告认为DVD没有用处。干预组有35名参与者，对照组有23名参与者完成了扫描且无运动伪影，χ(2)（1, 83）= 7.84，p <.001（对照组/干预组出现不满意结果的相对风险 = 3.09）。干预效果由自我效能感介导。
DVD干预措施有效，值得进一步研究以检验其普遍性。
