Skip to main content
. 2021 May 26;3(5):e200122. doi: 10.1148/ryai.2021200122

Figure 4:

Sample images show artifacts on multiecho spin-echo (MESE) or convolutional neural network (CNN) T2 maps. In patient 1, the CNN T2 map has removed pulsation artifacts that were apparent on the MESE T2 map. In patients 2 and 3, the CNN T2 map has visible artifacts. For patient 2, patient movement is seen along the superior-inferior axis on the double-echo in steady-state (DESS) scan, likely causing the artifact, as the discrepancy between the anatomic images confuses the CNN when predicting the T2 map. The source of the artifact for patient 3 is less clear, but it could be due to the network picking up incomplete fat suppression in the bone marrow and interpreting it as T2 variation. Such artifacts in the bone marrow do not affect the analysis of the femoral condyle cartilage. Cor = coronal, Sag = sagittal, TSE = turbo spin echo.

Sample images show artifacts on multiecho spin-echo (MESE) or convolutional neural network (CNN) T2 maps. In patient 1, the CNN T2 map has removed pulsation artifacts that were apparent on the MESE T2 map. In patients 2 and 3, the CNN T2 map has visible artifacts. For patient 2, patient movement is seen along the superior-inferior axis on the double-echo in steady-state (DESS) scan, likely causing the artifact, as the discrepancy between the anatomic images confuses the CNN when predicting the T2 map. The source of the artifact for patient 3 is less clear, but it could be due to the network picking up incomplete fat suppression in the bone marrow and interpreting it as T2 variation. Such artifacts in the bone marrow do not affect the analysis of the femoral condyle cartilage. Cor = coronal, Sag = sagittal, TSE = turbo spin echo.