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Fig. 1 | BMC Musculoskeletal Disorders

Fig. 1

From: Quantifying bone marrow inflammatory edema in the spine and sacroiliac joints with thresholding

Fig. 1

Example of placement of circular region of interest (ROI, ≥ 200 pixels) at the erector spinae muscles in short-tau inversion recovery (STIR) MR images of the spine (a) and gluteus maximus muscle in STIR MR images of the SI joints (c) of psoriatic arthritis patients for the normalization to signal from muscle tissue. For the selection of reference normal bone marrow signal as part of thresholding analysis, a circular ROI (≥ 200 pixels) was placed at a healthy vertebra in one slice of spinal images (a) and at the center of the first sacral vertebra in one slice in sacroiliac joint images (c). Example of thresholding of the volume of short-tau inversion recovery (STIR) hyper-intensity in a STIR MR image of the spine (b) corresponding to (a), and of sacroiliac joints (d) corresponding to (c). Vertebrae T10-L5 can be seen in (a) and (b). Inflammation was detected in T12. Iliac bones and sacrum are visible in (c) and (d)

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