01) increase in T1 (105 ± 94 ms) and decrease in T2 (14 ± 6 ms) when using water-fat-separated MRF, suggesting improved parameter quantification by reducing the well-known biases introduced by fat. Parameter maps in volunteers show a significant (P <. Phantom results show the robustness of the water-fat resolving MRF approach to undersampling. To test whether the approach is capable of measuring small in vivo dynamic changes in relaxation times, experiments were run in 9 healthy volunteers parameter values were compared with and without water-fat separation during muscle recovery after plantar flexion exercise. The method was first tested in a multicompartment phantom. Water and fat signals were matched to the on-resonance MRF dictionary. Conjugate phase reconstruction and fat deblurring were applied to correct for B0 inhomogeneities and chemical shift blurring. The single-run MRF acquisition uses an alternating in-phase/out-of-phase TE pattern to achieve water-fat separation based on a 2-point DIXON method. To minimize the known biases introduced by fat in rapid T1 and T2 quantification in muscle using a single-run magnetic resonance fingerprinting (MRF) water-fat separation sequence. It was determined that the activity of the deeper trunk muscles was higher in bracing than in hollowing on comparing the T2 values obtained in the MRI. No significant changes occurred in any muscle before and after hollowing.
MRI T2 values indicated that the TrA and IO regions were activated to a significantly greater degree after bracing. Subsequently, T2 values recorded before the exercise were compared with those recorded after the exercise to evaluate the extent of change effected by exercise on the muscles. The imaging was completed using Osirix software, which measured T2 values from the transversus abdominis (TrA), internal oblique (IO), external oblique (EO), and multifidus (MF) muscles. Subjects were 19 healthy adult males, of whom 10 (with mean height ± SD: 172.3 ± 4.7 cm, mean weight ± SD: 64.3 ± 5.4 kg, mean age ± SD 21.5 ± 1.9 years) performed hollowing and 9 (with mean height ± SD: 171.3 ± 2.1 cm, mean weight ± SD: 68.5 ± 11.7 kg, mean age ± SD: 23.0 ± 2.6 years) performed bracing. After hip replacement surgery, turning over into the side-lying position can be difficult, and should only be done when the surgeon allows it, preferably with the help of the physiotherapist at first.The purpose of this study was to compare the muscle activity of Bracing and Hollowing trunk exercises by means of T2 values using MRI. Following any hip problem, the muscles must recover their function, so the exercise should be done as soon as it is comfortable. In the early stages following a hip problem, if lifting the leg up is too difficult, just try to start the movement, lifting the leg very slightly off the supporting pillow - but only if this is painless.Īfter injury: The hip abductors can be weakened through direct injury, or through inactivity, perhaps following a back problem or a leg injury which has prevented walking or caused a limp. Look straight ahead, do not look down towards your feet. Keep your hips well forwards and your legs in line with your trunk and head. If one side is weaker, do more repetitions for that side. Repetitions and frequency: 5-10 times, on each side in turn, 1-2 times a day. Hold for a count of two, then slowly lower. Movements: Lift your uppermost leg a little way, keeping your hip well forward and your knee locked straight. Position: Lie on your side, with a pillow between your knees for greater comfort.
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