Figure 4.

Images of fixation metallic implant attached to the femur, consisting of a plate and seven screws: (a) sagittal view of a raw low-field image acquired with the 72 mT system (9 mm slice from $T_1$-weighted 3D-RARE acquisition with in-plane resolution of $1.3\times 2$ mm${}^2$, 12 min scan time, eight years after femoral shaft osteotomy); (b) same, but BM4D-filtered²⁷ and rescaled by $\times 2$ to increase the number of pixels; (c) lateral X-ray computed radiography (two weeks after surgery); (d) sagittal view of the same knee, acquired with a Siemens Skyra 3 T system ($T_1$-weighted 2D-RARE acquisition with slice thickness 3.9 mm and pixel resolution $0.26\times 0.26$ mm${}^2$, one year after surgery); and (e) 3D reconstruction from $T_1$-weighted 3D-RARE acquisition with isotropic resolution of 2 mm, 20 min scan time, where selected muscle and fat segments have been removed (eight years after surgery).