Jonathan Bishop
Current Organizations / Institutes
The organizations/institutes from the scholar's latest article
Jonathan Bishop has a total of 3 co-authors. Here are the top co-authors by number of shared publications:
Donald B. Plewes
Department of Medical Biophysics, University of Toronto, 2075 Bayview Avenue, North York, Ontario, M4N 3M5, Canada
1 shared publicationGreg Poole
The Department of Physics, University of Waterloo, Waterloo, Ontario, Canada
1 shared publicationMichael Leitch
1 shared publication
Latest Publications
- 1 November 1998
- Published by Wiley in Journal of Magnetic Resonance Imaging
- Vol. 8 (6) , 1257-1265
Magnetic resonance imaging of shear wave propagation in excised tissue
The propagation of shear waves in ex vivo tissue samples, agar/gel phantoms, and human volunteers was investigated. A moving coil apparatus was constructed to generate low acoustic frequency shear perturbations of 50 to 400 Hz. Oscillating gradients phase‐locked with the shear stimulus were used to generate a series of phase contrast images of the shear waves at different time‐points throughout the wave cycle. Quantitative measurements of wave velocity and attenuation were obtained to evaluate the effects of temperature, frequency, and tissue anisotropy. Results of these experiments demonstrate significant variation in shear wave behavior with tissue type, whereas frequency and anisotropic behavior was mixed. Temperature‐dependent behavior related mainly to the presence of fat. Propagation velocities ranged from 1 to 5 m/sec, and attenuation coefficients of from 1 to 3 nepers/unit wavelength, depending on tissue type. These results confirm the potential of elastic imaging attributable to the intrinsic variability of elastic properties observed in normal tissue, although some difficulty may be experienced in clinical implementation because of viscous attenuation in fat.
- 1 November 1998
- Published by Wiley in Journal of Magnetic Resonance Imaging
- Vol. 8 (6) , 1257-1265
Magnetic resonance imaging of shear wave propagation in excised tissue
The propagation of shear waves in ex vivo tissue samples, agar/gel phantoms, and human volunteers was investigated. A moving coil apparatus was constructed to generate low acoustic frequency shear perturbations of 50 to 400 Hz. Oscillating gradients phase‐locked with the shear stimulus were used to generate a series of phase contrast images of the shear waves at different time‐points throughout the wave cycle. Quantitative measurements of wave velocity and attenuation were obtained to evaluate the effects of temperature, frequency, and tissue anisotropy. Results of these experiments demonstrate significant variation in shear wave behavior with tissue type, whereas frequency and anisotropic behavior was mixed. Temperature‐dependent behavior related mainly to the presence of fat. Propagation velocities ranged from 1 to 5 m/sec, and attenuation coefficients of from 1 to 3 nepers/unit wavelength, depending on tissue type. These results confirm the potential of elastic imaging attributable to the intrinsic variability of elastic properties observed in normal tissue, although some difficulty may be experienced in clinical implementation because of viscous attenuation in fat.