Results 261 to 270 of about 61,316 (277)

A real vessel phantom for imaging experimentation

Medical Physics, 1997
Vascular phantoms are used to evaluate imaging techniques such as ultrasound (US), CT, and angiography. They are expected to mimic the vasculature, surrounding tissue, and blood, and therefore must meet specific requirements on the mimicking materials, with respect to x‐ray attenuation and acoustic properties (velocity, attenuation).
Aaron Fenster, Aaron Fenster, Aaron Fenster, David W. Holdsworth, David W. Holdsworth, David W. Holdsworth, W.J. Dabrowski, Joy Dunmore-Buyze, Joy Dunmore-Buyze, Richard N. Rankin, Richard N. Rankin   +10 more
openaire   +3 more sources

Increasing the utility of the mammographic phantom image.

Radiology, 1996
To increase the utility of the monthly accreditation mammographic phantom image, the authors added a light sensitometric strip on the same film. The optical densities of the steps on the sensitometric strip with values nearest those of the phantom background and disk were measured, and these optical densities and the density difference were recorded ...
Stephen Rudin, Daniel R. Bednarek
openaire   +3 more sources

Phantom Images

2012
kritische berichte - Zeitschrift für Kunst- und Kulturwissenschaften, Bd. 40 Nr.
openaire   +2 more sources

Phantoms for Magnetic Resonance Imaging

2013
Magnetic resonance imaging (MRI) provides exceptional soft tissue contrast and is capable of generating quantitative maps to demonstrate blood flow, water diffusion, temperature distribution, and tissue relaxation properties.
Reed Selwyn, Reed Selwyn
openaire   +2 more sources

Polymer gels for in-phantom dose imaging in radiotherapy

Applied Radiation and Isotopes, 2010
Normoxic polymer gel dosimeters are studied, with the aim of achieving a valid and advantageous method for in-phantom 3D dose determinations. Developments were carried out in the application of such dosimetric material to the method based on dosimeter gel layers that has shown good reliability for absorbed dose imaging in radiotherapy.
VANOSSI, ELENA, G. Gambarini, M. Carrara, MARIANI, MARIO   +3 more
openaire   +5 more sources

Phantom kidney on perfusion renal imaging

Seminars in Nuclear Medicine, 1984
A 67-year-old male presented with sudden onset of right flank pain and anuria. On examination he had signs of acute renal failure. An intravenous urogram showed a large right kidney with poor filling of the lower pole calyceal system suspicious for having a renal mass. The left kidney was not visualized. Renal ultrasonogram showed that the right kidney
openaire   +3 more sources

Nonlinear elasticity imaging: Theory and phantom study

IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 2004
In tissue the Young's modulus cannot be assumed constant over a wide deformation range. For example, direct mechanical measurements on human prostate show up to a threefold increase in Young's modulus over a 10% deformation. In conventional elasticity imaging, these effects produce strain-dependent elastic contrast.
Skovoroda, O'Donnell, Emelianov, Erkamp
openaire   +4 more sources

Computerized scheme for evaluating mammographic phantom images

Medical Physics, 2012
The authors developed a computer algorithm to automatically evaluate images of the American College of Radiology (ACR) mammography accreditation phantom.The developed algorithm consist of the edge detection of wax insert, nonuniformity correction of background, and correction for magnification and also calculate the cross-correlation coefficient by ...
Yoshie Kodera, Masaki Asahara
openaire   +3 more sources

An anthropomorphic torso section phantom for ultrasonic imaging

Medical Physics, 1980
Using stable materials capable of mimicking any soft tissues of the human body—quantitatively with respect to speed of sound, density, and attenuation coefficient and semiquantitatively with respect to scatter—we have constructed a torso section phantom containing simulated bowel gas, kidney, kidney fat pad, liver, tumor, cyst, bony structures, and ...
James A. Zagzebski, Thomaz Ghilardi-Netto, Ernest L. Madsen   +2 more
openaire   +3 more sources

The Charles Bonnet Syndrome: ‘Phantom Visual Images’

Perception, 1991
The Charles Bonnet syndrome is a condition in which individuals experience complex visual hallucinations without demonstrable psychopathology or disturbance of normal consciousness. An analysis of the sixty-four cases described in the literature reveals that the syndrome can occur at any age though it is more common in elderly people.
Ronald Melzack, Geoffrey Schultz
openaire   +3 more sources