Quality assessment in apples often requires the application of non destructive methods for detecting symptoms that are not visible externally. Various techniques such as NMR, MRI, Xray CT and time-resolved reflectance spectroscopy have been used to analyze the internal quality of fruits [1,2,3]. We report preliminary results showing that low field MRI has a potential for the internal quality in...

D. Wang, G. Cowin, K. McMahon, D. M. Doddrell Centre for Magnetic Resonance, The University of Queensland, Brisbane, Qld, Australia Introduction Gradient coils in magnetic resonance imaging (MRI) play an increasingly important role as many advanced imaging sequences developed in recent years normally require faster and stronger gradients. To meet this demand, gradient designers employed differe...

We retrospectively reviewed the magnetic resonance (MR) studies in nine patients with spinal cord hemangioblastoma. Five patients were studied with a low field magnet (0.35 T/0.5 T) and four with a high field magnet (1.5 T). Six tumors were thoracic and three cervical in location. Magnetic resonance imaging (MRI) was positive in all the nine patients. MRI permitted a specific diagnosis prior to...

Magnetic resonance imaging (MRI) is the fastest growing standard of care in diagnostic imaging. Because of its unique properties such as noninvasive accurate assessment of left ventricular (LV) volumes and regional LV wall motion abnormalities , quantification of flow and tissue characterisation, MRI utilisation in the US is still growing at approximately 3 % per year [1]. Moreover, indications...

This paper presents a method for correcting the geometric and greyscale distortions in diffusion-weighted MRI that result from inhomogeneities in the static magnetic field. These inhomogeneities may due to imperfections in the magnet or to spatial variations in the magnetic susceptibility of the object being imaged--so called susceptibility artifacts. Echo-planar imaging (EPI), used in virtuall...

PURPOSE We investigated the temporal variation of the induced magnetic field due to the transverse and the longitudinal gradient coils in tungsten collimators arranged in hexagonal and pentagonal geometries with and without gaps between the collimators. METHODS We modeled x-, y-, and z-gradient coils and different arrangements of single-photon emission computed tomography (SPECT) collimators ...

The INSERT is the world’s first clinical SPECT-MRI brain imaging system based on scintillation detectors with a silicon photomultiplier readout. Here, we demonstrate its use within MRI environment for time. Using standard transmit-receive head coil, and an appropriate selection of custom sequence (GRE), overcome mutual interference. bulky 50kg tungsten collimator introduce magnetic field inhomo...

Brachial Plexus Injury (BPI) is an uncommon complication of median sternotomy capable of causing a permanent or transitory sensitivity and/or motor function impairment in the upper limbs. During a cardiac surgery through sternotomy, for the assessment of the thoracic cage configuration and the site of mediastinal structures, a broader surgical field may be required. If the sternal retractors ar...

Q. Wei, S. Crozier, B. Xu, A. Trakic, B. Li, F. Liu School of Information Technology and Electrical Engineering, The University of Queensland, Brisbane, QLD, Australia Synopsis An finite-difference time-domain (FDTD) simulator has been developed for electromagnetic analysis and design applications in MRI. It is intended to be a complete FDTD model of an MRI system including all RF and low-frequ...