Results 251 to 260 of about 118,809 (292)
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A simple tissue-like ultrasound phantom material
The British Journal of Radiology, 1982Routine testing and calibration of modern grey-scale ultrasound scanning equipment and the training of operators in its proper application can often benefit from the use of tissue-like phantoms. For example, checking of display systems, simple registration checks or familiarization with the operation of scanner controls to achieve optimal results, can ...
R A, Lerski, T C, Duggan, J, Christie
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Tissue phantom ratios for a Clinac 4/100
Medical Physics, 1982Tissue phantom ratios (TPR), based on a normalization depth of 5 cm, have been measured in water for field sizes from 5×5 cm2 to approximately 40×40 cm2 and for depths from 1 to 40 cm for a Varian Clinac 4/100. These TPR's have been compared with those calculated from percent depth doses measured at the same time, and the two sets of data generally ...
P J, Biggs +3 more
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Electrical properties of phantoms for mimicking breast tissue
2017 39th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC), 2017In order to test and calibrate an EIT (Electrical Impedance Tomography) system, many researchers rely on phantoms mimicking breast tissues. These phantoms are usually made of saline solutions, agar and/or vegetables, allowing the user to set the conductivity of the material by changing the salt concentration.
Vinicius G. Sirtoli +2 more
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Tissue equivalent vessel phantoms for intravascular ultrasound
Ultrasound in Medicine & Biology, 1997A tissue equivalent arterial vessel phantom has been developed for use in intravascular ultrasound imaging studies. The phantom material is constructed from a cross-linked gelatin matrix to which amorphous silica scattering particles are added. The ultrasonic properties (speed of sound, frequency-dependent attenuation coefficient and frequency ...
L K, Ryan, F S, Foster
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Thermal Properties of Tissue Equivalent Phantom Materials
IEEE Transactions on Biomedical Engineering, 1984Thermal conductivity, specific heat, density, and thermal diffusivity were determined for standard RF and microwave phantom materials. Thermal conductivity data for seven phantom materials of varying aluminum content were analyzed using mixture theories. With the thermal diffusivity values obtained, worst case errors in SAR determination due to thermal
J B, Leonard, K R, Foster, T W, Athey
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Composition of MRI phantom equivalent to human tissues
Medical Physics, 2005We previously developed two new MRI phantoms (called the CAG phantom and the CAGN phantom), with T1 and T2 relaxation times equivalent to those of any human tissue at . The conductivity of the CAGN phantom is equivalent to that of most types of human tissue in the frequency range of . In this paper, the relaxation times of human tissues are summarized,
Hirokazu, Kato +7 more
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Perfused Phantom Models of Microwave Irradiated Tissue
Journal of Biomechanical Engineering, 1986The theoretical basis, practical design considerations, and prototype testing of a perfused model suitable for simulation studies of microwave heated tissue are presented. A parallel tube heat exchanger configuration is used to simulate the internal convection effects of blood flow. The global thermal response of the phantom, on a scale of several tube
J W, Baish, K R, Foster, P S, Ayyaswamy
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Photodynamic assay of light distributions in tissue phantoms
Lasers in Surgery and Medicine, 1988AbstractThe distribution of light in tissues of varying blood content has been modeled using a gel agar system as a tissue phantom. Hematoporphyrin derivative (Photofrin I or HpD) was suspended in gels, along with a chemical indicator of its cytotoxic intermediate (singlet oxygen), and various amounts of red blood cells.
L W, Mason, A J, Welch, M J, van Gemert
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A solid tissue phantom for photon migration studies
Physics in Medicine and Biology, 1997A solid tissue phantom made of agar, Intralipid and black ink is described and characterized. The preparation procedure is fast and easily implemented with standard laboratory equipment. An instrumentation for time-resolved transmittance measurements was used to determine the optical properties of the phantom.
CUBEDDU, RINALDO +4 more
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Visualization of Methemoglobin Distribution in Tissues: Phantom Validation
2018Methemoglobin (MetHb) is an important biomolecule, which is involved in a number of pathways associated with reactive oxygen species (ROS). Thus, MetHb has a potential to be used as a surrogate measure of ROS activity. Unfortunately, most of the existing clinical modalities used for MetHb concentration measurements determine the systemic MetHb level ...
G, Saiko +3 more
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