This study has demonstrated that either of the interventions used can significantly reduce pre-MRI anxiety, with the video performing slightly better than the phone call intervention. Importantly, the routine appointment letter did not contain enough information to satisfy most patients, which argues strongly for a change in current practice.
PURPOSE: To develop and validate a psychometric scale for assessing Image quality perception for chest radiographs.METHODS: A review of the literature was undertaken to identify items/factors which could be used to evaluate image quality using a perceptual approach. A draft scale was then created (22 items) and presented to a focus group (student, qualified radiographers and radiology registers). Within the focus group the draft scale was discussed and modified. A series of seven postero-anterior chest images were generated using a phantom with a range of image qualities. Image quality perception was initially confirmed for the seven images using signal-to-noise ratio (SNR) and group consensus. Participants were invited to independently score each of the images using the draft image quality perception scale. Bandura's theory was used to guide scale development and Cronbach alpha was used to test interval reliability.RESULTS: Fifty three participants used the scale to grade image quality perception on each of the seven images (SNR 17.2 to 36.5). Aggregated mean scale score increased with increasing SNR from 42.1 to 87.7 (r=0.98, P<0.001). For each of the 22 individual scale items there was clear differentiation of low, mid and high-quality images. A Cronbach alpha coefficient of >0.7 was obtained across each of the seven images.CONCLUSION: This study represents the first development of a chest image quality perception scale based on Bandura's theory. There was excellent correlation between the image quality perception scores derived using the scale and the SNR and group consensus. Further research will involve a more detailed item and factor analysis.
The acquisition parameters used for AP pelvis on the x-ray tabletop are not transferable to trolley imaging and should be modified accordingly to compensate for the differences that exist. Exposure charts should be developed for trolley imaging to ensure optimal image quality at lowest possible dose.
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