Amitabh J. Dwyer

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Pulsatile motion of the spinal cord was examined with phase imaging techniques. Sagittal images of the spinal cord were obtained at different times of the cardiac cycle in healthy volunteers, as well as in patients in whom the spinal cord either was tethered, was compressed, or contained an intramedullary lesion. Pulsatile velocity changes of the spinal(More)
The significance of linear regions of altered signal intensity that appear in sagittal magnetic resonance (MR) images along the length of the spinal cord was investigated. Examinations were performed on ten healthy volunteers and one patient with spinal cord edema. A 0.5-T or a 1.5-T MR system was used. Sampling-related effects (Gibbs phenomenon) at spinal(More)
The authors measured cerebral glucose metabolism (CMRglu) using [18F]fluoro-2-deoxyglucose (FDG) positron emission tomography (PET) in patients with brain tumors to evaluate the effect of exogenous corticosteroids (in this instance, dexamethasone) on glucose metabolism. Fifty-six FDG-PET studies obtained in 45 patients with unilateral supratentorial brain(More)
Sclerosteosis or Van Buchem's disease is a rare genetic craniotubular hyperostosis that becomes evident in early childhood and is associated with progressive involvement of the skull. The pathologic changes in the cranium noted on CT are described in three cases. Although the disease is incurable, CT is useful to display the morbid anatomy of the cranium(More)
It is well recognized that the MR appearance of intracranial bleeding changes with the age of lesion. It is also well known that hemoglobin in stagnating blood undergoes oxidation to methemoglobin, a substance that lowers the relaxation times of surrounding water protons. To study these phenomena in a controlled way, about 3 ml of blood was injected into(More)
To enhance the contrast between cerebrospinal fluid (CSF), brain, spinal cord, and surrounding meninges and bone on magnetic resonance (MR) images, as well as to study CSF flow, gadolinium-DTPA was injected in the subarachnoid space of eight monkeys. Six doses of progressively higher concentrations (from .125 mmol to 250 mmol) were injected every 30-40(More)
A metastatic brain-tumor model has been developed in rabbits by infusing the VX2 carcinoma into the internal carotid artery to simulate hematogenous dissemination of tumor. In a series of 25 New Zealand White rabbits, multiple metastases arose in the hemisphere of 24 (96%) and in the eye of 22 (92%); in all instances ocular metastases were ipsilateral to(More)
BACKGROUND Enhanced recovery program (ERP) was implemented to optimize the hospital stay in total hip arthroplasty. This study assessed the effects of optimizing preoperative and perioperative care using enhanced recovery (ER) on patients undergoing Total hip arthroplasty. MATERIALS AND METHODS We compared a prospective group of 64 patients on the ER(More)
UNLABELLED BACKGROUND Cast bracing (CB) has been a well established method of treating tibial shaft fractures. Majority of the recent literature on treatment of tibial shaft fractures have upheld intramedullary nailing (IMN) as the treatment of choice. Most of these studies are from the west, in public funded health set ups and in hospitals with very low(More)
AIM To evaluate mid-term outcome in patients who underwent arthroscopic subacromial decompression (ASD) for shoulder impingement syndrome with intact and partially torn rotator cuffs. MATERIALS AND METHODS A total of 80 consecutive patients (83 shoulders) who underwent ASD for impingement syndrome between 2003 and 2006 were analyzed. Mean age was 57.1(More)