Attenuation of ultrasound in skeletal muscle

Nassiri, D. K.; Nicholas, D.; Hill, Christopher

doi:10.1016/0041-624x(79)90054-4

Cited by 64 publications

(49 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The attenuation of the transmitted signals in resting muscle was roughly estimated by comparing the maximum amplitude of the transmitted wave trains in the muscle with the corresponding value in pure water assuming that the attenuation of the waves is -0-1 dB/cm in pure water, and was found to be -10 dB/cm with 6 MHz wave at 20 'C. This value agreeA well with that reported by Nassiri, Nicholas & Hill (1979) As the method illustrated in Fig. 2 only measures the relative wave velocity changes, the absolute wave velocities were determined under various conditions by measuring the interval between the mid-point of the rising phase of the second or the third wave in the original wave train and the corresponding point in the transmitted wave train on a digital oscilloscope (Tektronix, type 2445A).…”

Section: Methodssupporting

confidence: 80%

Stiffness changes in frog skeletal muscle during contraction recorded using ultrasonic waves.

Hatta

Sugi

Tamura

1988

The Journal of Physiology

View full text Add to dashboard Cite

SUMMARY1. A technique has been developed with which the stiffness changes in frog skeletal muscle can be continuously recorded by measuring the propagation velocity of ultrasonic waves (3-7 MHz) with negligibly small perturbations to the contractile system.2. The resting muscle stiffness was 2 256+00002 x 109 N/m2 (S.D.) at 1-2°C (n = 10) and 2-480+0-007 x 109 N/M2 at 19-20°C (n = 12) in the longitudinal direction, and 2-223 + 04008 x 109 N/m2 at 1-2°C (n = 8) and 2 437 + 0 007 x 109 N/M2 at 19-20°C (n = 9) in the transverse direction.3. The resting muscle stiffness measured with ultrasonic waves was virtually insensitive to the resting force development, i.e. the extension of the parallel elastic component.4. The longitudinal muscle stiffness increased during isometric contraction at a rate faster than the force development. The amount of increase of the longitudinal stiffness in an isometric tetanus at 2 2 ,um sarcomere length was 24 ±+01 x 107 N/M2 at 1-2°C (n = 10) and 6-5 + 1-3 x 107 N/m2 at 19-20°C (n = 12).5. On the other hand, the transverse muscle stiffness decreased during isometric contraction at a rate faster than the force development. The amount of decrease of the transverse stiffness in an isometric tetanus at 22 jtm sarcomere length was 5-6+01 x 107 N/M2 at 1-2°C (n = 8) and 64+0-3 x 107 N/M2 at 19-20°C (n = 9).6. The amount of both the longitudinal and the transverse stiffness changes during an isometric tetanus decreased linearly with increasing sarcomere length, indicating that the stiffness changes during contraction reflect the formation of cross-links between the myofilaments.7. Both the longitudinal and the transverse stiffness increased when resting muscle was put into rigor state. The rigor muscle stiffness was insensitive to small stretches, i.e. the strain of the rigor cross-links.8. These results are discussed in connection with the behaviour of cross-bridges during isometric contraction and in rigor.

show abstract

Section: Methodssupporting

confidence: 80%

Stiffness changes in frog skeletal muscle during contraction recorded using ultrasonic waves.

Hatta

Sugi

Tamura

1988

The Journal of Physiology

View full text Add to dashboard Cite

show abstract

“…The relatively low ultrasonic frequency adopted for measurement in this work (1.0 MHz) was selected in order to minimize dispersion of the elastic signal in an otherwise highlyattenuating medium. Notably, the relationship between the frequency of the disturbance and attenuation within skeletal muscle was investigated in detail by Nassiri et al [15].…”

Section: Methodsmentioning

confidence: 99%

On the behaviour of porcine skeletal muscle tissue under shock compression

Wilgeroth

Hazell

Appleby-Thomas

2012

International Journal of Impact Engineering

View full text Add to dashboard Cite

“…Blood: specific heat = 220 Jkg -1-K -1, density = 1,060 kgrn -3 (c) * Along fibers ** Across fibers Neilsen andLarsen (1973) b Melander andJohanson (1968) ¢ Keele and Neil (1971) d Lehman et al (1978) e Guy et al (1974) f Spells (1961) g Calculated from: thermal diffision = conductivity/specific heat/density h Frizzell (1976) i Chivers et al (1978) J Goss et al (1978) k Nassiri et al (1979) I Goss et al (1979 The effect of more realistic perfusion, where the advancing front is well perfused and the centre is necrotic (Fig. 2B), was calculated with a one-dimensional model because of the required small space steps.…”

Section: Computer Modelsmentioning

confidence: 99%

The effects of some physical factors on the production of hyperthermia by ultrasound in neoplastic tissues

Hynynen

Watmough

Mallard

1981

Radiat Environ Biophys

View full text Add to dashboard Cite

A one-dimensional and a three-dimensional computer model have been built in order to study the importance of blood flow and ultrasonic absorption in tissues during local hyperthermia. The decreased blood flow in the interior of certain tumours and possibly the increased ultrasonic absorption of the malignant tissue in some cases may cause selectively higher temperatures inside the tumours though the heat input is the same as in the surrounding tissues. Also, the vasodilation of blood vessels in normal tissues as a response to heat causes a therapeutically useful temperature difference. These blood flow differences can lead to enhanced effects during sonication to produce hyperthermia in the tumour. The inhomogeneity of blood flow in the tumour causes a non-uniform temperature distribution leaving the well-perfused cells in the advancing front at a much lower temperature than the cells in the necrotic centre. Thus, the combination of local hyperthermia with radio-and chemotherapy seems to offer the most attractive means of destroying malignant tissue.

show abstract

Attenuation of ultrasound in skeletal muscle

Cited by 64 publications

References 6 publications

Stiffness changes in frog skeletal muscle during contraction recorded using ultrasonic waves.

Stiffness changes in frog skeletal muscle during contraction recorded using ultrasonic waves.

On the behaviour of porcine skeletal muscle tissue under shock compression

The effects of some physical factors on the production of hyperthermia by ultrasound in neoplastic tissues

Contact Info

Product

Resources

About