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Pars defect L4. (a) The sagittal T1 weighted and (b) T2 weighted images do not demonstrate the defect well. (c) The defect is best seen on sampling perfection with application-optimised contrasts using different flip angle evolutions (SPACE), sagittal reformat. The SPACE sequence allows for isotropic reconstruction in any plane; the thin slice thickness with still-adequate signal-to-noise ratio allows for better depiction of normal and abnormal anatomy.
