Figure 2. Normalized signal intensities as a function of time, for the phantom illustrated in figure 1. Solid, short dashed and long dashed lines represent the signal intensities measured in the supply line, right maxillary sinus, and left maxillary sinus respectively. The signals were normalized to the peak intensity of the supply line. Left os size: 12 mm. Right os size: 113 mm. MRI of Hyperp...

actual focal spot automatic exposure control comparator coulomb/kilogram detector effective focal spot focal spot blooming grid latitude grid uniformity half-value layer high-frequency homogenous phantom ion chamber kilowatt rating Law of Reciprocity linear tomography line focus principle linearity mobile x-ray generator objective plane photodetector pluridirectional tomography portable x-ray g...

The quadrupole peaks arising due to immobile proteins in muscle are clearly visible (see arrows). Figure 1: Dispersion curves for a phantom of crosslinked BSA obtained using the FC-FSE sequence (solid dots) show good agreement with results from a commercial relaxometer (open circles). Rapid Field-Cycling Relaxometric Imaging using Fast Spin-Echo Peter J Ross, Lionel M Broche, Kerrin J Pine, and...

A gynaecological applicator consisting of a metallic intra-uterine tube with a plastic vaginal applicator and an HDR Ir-192 source have been simulated with MCNP5 (Monte Carlo code). A solid phantom has been designed to perform measurements around the applicator with radiochromic films. The isodose curves obtained are compared with curves calculated with the F4MESH tally of MCNP5 with a good agr...

It would be useful to develop a tissue equivalent gel to improve the uniformity of the electromagnetic field in the human body, and for making a tissue equivalent dielectric human phantom. In this study, solid type, water based gelatin-honey gels were developed which have the electrical characteristics of skin tissue. It was demonstrated that a stable and homogeneous gel, with a relative dielec...

OBJECTIVES The aim of this phantom study was to minimize the radiation dose by finding the best combination of low tube current and low voltage that would result in accurate volume measurements when compared to standard CT imaging without significantly decreasing the sensitivity of detecting lung nodules both with and without the assistance of CAD. METHODS An anthropomorphic chest phantom con...

The purpose of this study is to evaluate the accuracy of the electron Monte Carlo (eMC) dose calculation algorithm included in a commercial treatment planning system and compare its performance against an electron pencil beam algorithm. Several tests were performed to explore the system's behavior in simple geometries and in configurations encountered in clinical practice. The first series of t...

A method of generating images through highly scattering media is presented that involves comparing measurements of the time-dependent intensity of transmitted light with an analytical model describing the sensitivity of that intensity on localized changes in optical properties. A least-squares fitting procedure is employed to derive the amplitudes of the measurement perturbations caused by embe...