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Evaluation of simultaneous multislice acquisition with advanced processing vs. conventional sequence in free-breathing DWI for liver patients
Mihaela Rata1, Katja De Paepe1, Matthew R Orton1, Erica Scurr1, Julie Hughes1, Alto Stemmer2, Marcel Dominik Nickel2, and Dow-Mu Koh1
1Royal Marsden Hospital and Institute of Cancer Research, London, United Kingdom, 2Siemens Healthcare, Erlangen, Germany
The study assessed the image quality of free-breathing DWI acquisitions from 25 patients with liver metastases and compared SMS (with/without advanced processing) DWI with standard bipolar echo planar DWI. The SMS protocol with advanced processing was faster and showed better image quality.
Figure 1: b750 images and ADC maps of liver metastases from two patients from each cohort: a 53-year old woman (top / cohort 1) with colorectal cancer and a 61-year old man with bowel cancer (bottom / cohort 2).Note the increased homogeneity signal across the slice on both b-value and ADC images when using the prototype DWI with advanced options (columns 1 vs. 4). Moreover, the advanced option allows for a better delineation of the liver or blood vessels as seen on the b750 images.
Table 2: Mean scores of the overall image quality for each type of images (b100, b750 and ADC map) and each DWI method as derived from the 25-patient cohort. Highlighted in green are the top scores and in red the lowest scores given by the two radiologists (scoring scale was from 1 to 3).