High-speed low-resolution ADCs are widely used for various applications, such as 60GHz receivers, serial links, and high-density disk drive systems. Flash architectures have the highest conversion rate without employing time-interleaving. Moreover, flash architectures have the lowest latency, which is often required in feedback-loop systems. However, the… (More)
Nambu PVA gel which is produced by repeated freezing and thawing of PVA solution has overcome almost all of the problems which present substances have: It is close to human soft tissue in MRI parameters. MRI parameters (1H density, T1, T2) are adjustable to some extent. It has appropriate physical characteristics. The important problem with PVA gel is… (More)
Nuclear magnetic resonance (NMR) imaging was used to evaluate the intracerebral changes over time in gerbils after unilateral carotid artery ligation. Each animal was imaged during one of three stated periods 3-28 hr after surgery and again after administration of dexamethasone, morphine, or naloxone, agents reported to affect the clinical outcome of… (More)
This paper presents our ongoing project in which normal human anatomy and its quantitative data are systematically arranged in a computer. The final product, the Computerized Three-Dimensional Normal Atlas, will be able to supply tomographic images in any direction, 3-D images, and coded information on organs, e.g., anatomical names, CT numbers, and T1 and… (More)
The value of magnetic resonance imaging (MRI) in the diagnosis of acoustic tumors was retrospectively assessed in 38 cases. A 0.15 Tesla permanent magnet and a 1.5 Tesla superconducting magnet were employed in 24 and 14 cases, respectively. Gadolinium diethylene triamine pentaacetic acid (Gd-DTPA), a paramagnetic contrast agent, was used in 10 cases.… (More)
A direct coronal CT scanning technique for the trunk, named "Quasi-Coronal" CT, is presented and its usefulness demonstrated with clinical examples. Patients are placed in the lateral position on a wide plate laid on the scanner bed and instructed to assume various special postures. An important concept of this technique is to obtain the tomograms in which… (More)
A television monitoring technique was developed to analyze patient head motion during cranial computed tomography (CT). The graphs recorded with this system, craniokymograms, are compared with simultaneous CT images. Two other applications of this system are shown with examples of experimental data.