Results 261 to 270 of about 349,914 (309)
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Intensity Modulation of Olfactory Acuity.
Behavioral Neuroscience, 2003Acuity is fundamental to sensory systems, establishing the foundation for detectable differences in stimulus quality and consequently shaping animals' sensory capacities. In the olfactory system, which samples intrinsically high-dimensional chemical information, acuity for odor quality is measurable by means of ad hoc dimensions based on behaviorally ...
Thomas A. Cleland, Venkata Anupama Narla
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Compensators for intensity-modulated beams
Medical Dosimetry, 2002This study describes the importance of attenuator scatter in the construction of compensators. The attenuator used in this study was Lipowitz metal, commonly referred to as cerrobend. Linear attenuation coefficients of cerrobend were measured in air for different thickness of cerrobend sheets and different field sizes for a 6-MV photon beam.
D M, Dimitriadis, B G, Fallone
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Intensity-Modulated Radiotherapy
2012Intensity-modulated radiotherapy (IMRT) is a radiation delivery technique that allows “dose sculpting” to improve target coverage while sparing normal tissues. In an IMRT plan, the number of photons delivered (or “fluence”) varies within a field. Such variability can be used to avoid normal structures with lower radiation tolerance than the cancer and ...
Bridget F. Koontz +2 more
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Intensity-modulated arc therapy simplified
International Journal of Radiation Oncology*Biology*Physics, 2002We present a treatment planning strategy for intensity-modulated radiation therapy using gantry arcs with dynamic multileaf collimator, previously termed intensity-modulated arc therapy (IMAT).The planning strategy is an extension of the photon bar arc and asymmetric arc techniques and is classified into three levels of complexity, with increasing ...
Eugene, Wong +2 more
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Reshapable physical modulator for intensity modulated radiation therapy
Medical Physics, 2002A new method of generating beam intensity modulation filters for intensity modulated radiation therapy (IMRT) is presented. The modulator was based on a reshapable material, which is not compressible but can be deformed under pressure. A two‐dimensional (2D) piston array was used to repeatedly shape the attenuating material.
Tong, Xu +3 more
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Vertical-cavity saturable absorber intensity modulator
Journal of Lightwave Technology, 2003We propose and demonstrate a reflection-type optical modulator, with surface-normal architecture, that exploits the optical saturation of absorption in semiconductor quantum wells. The modulation section of the modulator, which is composed of quantum wells placed within a Fabry-Perot cavity, is optically controlled by an intensity-modulated beam ...
M, Guina +5 more
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Medical Physics, 2004
As compared with multi-leaf collimator based intensity modulated radiation therapy (IMRT) techniques, physical modulators have the major advantage of temporally invariant intensity map delivery which makes it more flexible with monitor unit rate, simpler resolution of interrupted treatment and easier implementation and use with respiratory gating ...
Tong, Xu +2 more
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As compared with multi-leaf collimator based intensity modulated radiation therapy (IMRT) techniques, physical modulators have the major advantage of temporally invariant intensity map delivery which makes it more flexible with monitor unit rate, simpler resolution of interrupted treatment and easier implementation and use with respiratory gating ...
Tong, Xu +2 more
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2015
Intensity-modulated sensors were defined in Chapter 2 as sensors that detect the variation of the intensity of light associated with the perturbing environment. The general concepts associated with intensity modulation include transmission, reflection, and microbending. However, several other mechanisms that can be used independently (intrinsically) or
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Intensity-modulated sensors were defined in Chapter 2 as sensors that detect the variation of the intensity of light associated with the perturbing environment. The general concepts associated with intensity modulation include transmission, reflection, and microbending. However, several other mechanisms that can be used independently (intrinsically) or
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Modulated Gain Intensity Recorder
IEEE Transactions on Geoscience Electronics, 1972A simple modification of conventional intensity recorders substantially increased their inherently low dynamic range at a slight sacrifice of S/N processing gain. The implemented modification consisted of a square wave modulation of the gain of the recorder amplifier. It was tested on two standard intensity recorders with satisfactory results presented
Frank G. Nawar, Leon Baum
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CIM—Compact intensity modulation
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2008Compact intensity modulation (CIM), a new method to modulate the intensity of a neutron beam is demonstrated. CIM allows the production of arbitrary signals where the focus point can be chosen and changed without any constraints. A novel feature in this technique compared to spin echo techniques is that the neutron polarization is kept parallel or anti-
M. Bleuel, E. Lang, R. Gähler, J. Lal
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