Automatic assessment of muscle/fat temporal variations on MR images of the thigh

Barra, Vincent; Morio, Béatrice; Colin, Aurélien; Vermorel, M.; Boire, Jean-Yves

doi:10.1109/iembs.1996.652725

Cited by 4 publications

(7 citation statements)

References 3 publications

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“…The subjects were scanned in a supine position with their arms folded over their chests, a cushion between their thighs and with their feet tied together. The MRI were acquired on a MAGNE-TOM 1T imager (Siemens, Erlangen, Germany) with a spin echo sequence (see Barra et al 1996). The body coil was used for both signal detection and radio-frequency transmission for imaging.…”

Section: Mri Of Thigh Musculature and Fatty Tissuesmentioning

confidence: 99%

“…The imaging protocol was as follows: a repetition time of 2 000 ms, echo time of 15 ms and a¯ip angle of 90°. The ®eld of view was 450 mm and the resulting images were coded into a 256´256 matrix, leading to a scanning time of 8 min 36 s. The volume was imaged into 32 transverse, 5-mm thick slices and spaced 5-mm apart, located from the hip to the patella (Barra et al 1996). To ensure that transaxial images were obtained from exactly the same anatomical location, three frontal views of the thighs were taken and the bottom slice was positioned at the bottom end of the right femur epiphysis (Fig.…”

Section: Mri Of Thigh Musculature and Fatty Tissuesmentioning

confidence: 99%

“…The total volumes of muscle, subcutaneous fat and intermuscle fat in successive images were calculated by using an automatic segmentation method developed by Barra et al (1996). Because of strong partial volume eects between bone marrow and muscle in the epiphysis, only the ®rst 20 slices of the thigh beginning from the hip were considered.…”

Section: Mri Of Thigh Musculature and Fatty Tissuesmentioning

confidence: 99%

“…The resulting image was then scanned four times in the four main directions, slice by slice, to segment subcutaneous fat from inter-muscle fat. Finally, the process ended with the counting of muscle, subcutaneous fat and inter-muscular fat voxels (Boire et al 1992; Barra et al 1996;Fig. 2).…”

Section: Mri Of Thigh Musculature and Fatty Tissuesmentioning

confidence: 99%

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Benefit of endurance training in elderly people over a short period is reversible

Morio¹,

Barra

Ritz³

et al. 2000

European Journal of Applied Physiology

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The present study assessed daily activity, physical capacity and body composition in 11 initially sedentary healthy subjects [5 men and 6 women, mean age 62.8 (SD 2.7) years] before training (T(o)), after completion of 7 (T(7w)) and 14 (T(14w)) weeks of training, and again 6 (T(6m)) and 12 (T(12m)) months after training. The mean daily activity index decreased from T(7w) to T(12m) reaching a lower level than at T(o) [T(12m) - T(o) = -1.5 (SD 4.6) units, P = 0.18]. Mean maximal oxygen uptake (VO(2max)) and its corresponding mean power output (Wdot(max)) were increased by 12.5 (SD 6.6)% (P = 0. 003) and 22.8 (SD 12.8)% (P = 0.003), respectively, at T(14w), and returned to their T(o) levels within 1 year. Mean body mass (m(b)) remained stable until T(6m) but increased significantly by 2.6 (SD 3. 7)% from T(6m) to T(12m) (P < 0.05). Mean fat mass (m(f), from bioelectrical impedance analysis measurements) tended to decrease [-2.0 (SD 4.2)%, P = 0.10] during the training period but increased by 7.8 (SD 10.9)% between T(6m) and T(12m) (P < 0.05). The mean fat free mass did not vary during the study period (P = 0.81) but magnetic resonance imaging (MRI) showed that mean thigh muscle volume decreased between T(7w) and T(12m) to less than at T(o) [T(12m) - T(o) = -2.3 (SD 3.6)%, P = 0.05]. Therefore, this study confirmed the favourable effects of endurance training on the physical capacity and body composition of elderly people, but demonstrated that the training programme would have to be continued to maintain the training-related benefits (i.e. increased VO(2max) and Wdot(max)) which would otherwise be lost within 1 year. After training, m(b) and m(f) were found to be increased. Furthermore, a fast and reproducible MRI protocol was validated for study of small intra-individual variations in tissue volumes in longitudinal studies.

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Section: Mri Of Thigh Musculature and Fatty Tissuesmentioning

confidence: 99%

Section: Mri Of Thigh Musculature and Fatty Tissuesmentioning

confidence: 99%

Section: Mri Of Thigh Musculature and Fatty Tissuesmentioning

confidence: 99%

Section: Mri Of Thigh Musculature and Fatty Tissuesmentioning

confidence: 99%

See 2 more Smart Citations

Benefit of endurance training in elderly people over a short period is reversible

Morio¹,

Barra

Ritz³

et al. 2000

European Journal of Applied Physiology

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show abstract

“…In order to compute muscle, subcutaneous fat and inter-muscular fat volumes in the MR images, a specific image processing method was developed, based on preliminary work described in ref. [3]. Because of strong partial volume effects between bone marrow and muscle in the epiphysis, only the first twenty slices of the thigh, starting from the hip, were considered.…”

Section: Magnetic Resonance (Mr) Image Processingmentioning

confidence: 99%

Effects of Two Electrical Stimulation Frequencies in Thigh Muscle After Knee Surgery

et al. 2002

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The purpose of this study was to compare the effects of two protocols of electrical stimulation combined with voluntary contractions on the recovery of thigh muscles after anterior cruciate ligament (ACL) surgery. Ten sportsmen with a mean age of 26 yrs were randomly assigned into two groups: a 80 Hz stimulated group (5 patients) and a 20 Hz stimulated group (5 patients). All patients received electrical stimulation of the quadriceps femoris, five days a week, for 12 weeks, and had a standard program of voluntary contractions. Muscle and fat volumes of the thigh were assessed using MRI before surgery and after 12 weeks of rehabilitation. Quadriceps and hamstring muscle strength were evaluated by isokinetic measurements. Twelve weeks after surgery, the quadriceps peak torque deficit in the operated limb with respect to the non operated limb at 180 degrees /s and 240 degrees /s was significantly (p < 0.05) less in the 20 Hz group than in the 80 Hz group. This difference was not confirmed when comparing the pre-surgery quadriceps peak torque of the operated limb with the post-surgery one. Subcutaneous fat volume was increased for the two groups at the post-surgery test. This increase was significantly (p < 0.05) greater for the 80 Hz group. Thigh muscle volume deficit was not significantly different between the two groups.

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Ultrasound imaging in lower limb prosthetics

Douglas

Solomonidis

Sandham

et al. 2002

IEEE Trans. Neural Syst. Rehabil. Eng.

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The biomechanical interaction between the residual limb and the prosthetic socket determines the quality of fit of the socket in lower limb prosthetics. An understanding of this interaction and the development of quantitative measures to predict the quality of fit of the socket are important for optimal socket design. Finite-element modeling is used widely for biomechanical modeling of the limb/socket interaction and requires information on the internal and external geometry of the residual limb. Volumetric imaging methods such as X-ray computed tomography, magnetic resonance imaging, and ultrasound have been used to obtain residual limb shape information. Of these modalities, ultrasound has been introduced most recently and its development for visualization in prosthetics is the least mature. This paper reviews ultrasound image acquisition and processing methods as they have been applied in lower limb prosthetics.

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Automatic assessment of muscle/fat temporal variations on MR images of the thigh

Cited by 4 publications

References 3 publications

Benefit of endurance training in elderly people over a short period is reversible

Benefit of endurance training in elderly people over a short period is reversible

Effects of Two Electrical Stimulation Frequencies in Thigh Muscle After Knee Surgery

Ultrasound imaging in lower limb prosthetics

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