✦ LIBER ✦

The use of wiener deconvolution (an optimal filter) in nuclear magnetic resonance imaging

✍ Scribed by John H. Letcher

Publisher: John Wiley and Sons
Year: 1989
Tongue: English
Weight: 396 KB
Volume: 1
Category: Article
ISSN: 0899-9457
DOI: 10.1002/ima.1850010112

No coin nor oath required. For personal study only.

✦ Synopsis

A computer software technique has been developed and employed to insert a modified-Wiener-deconvolution filter (an optimal filter) immediately following the quadrature detector of a magnetic resonance imager. The purpose of this effort is to try to suppress the undesirable effect of the noise found in the magnetic resonance imaging receiving antenna. This technique convolves the sampled real and imaginary signals taken directly from the antenna quadrature detector with a transfer function which is expressed in terms of the power spectrum of the measured signal with noise and the measured power spectrum of the noise, alone. The latter factor is measured during the dummy cycles which precede a normal scan sequence. Results are presented using data taken with a commercially available phantom.

📜 SIMILAR VOLUMES

Whole-body nuclear magnetic resonance im

Whole-body nuclear magnetic resonance imaging: The first report of its use in surgical practice

✍ J. E. Pollet; F. W. Smith; J. R. Mallard; A. K. Ah-See; Anne Reid 📂 Article 📅 1981 🏛 John Wiley and Sons 🌐 English ⚖ 178 KB 👁 2 views

## Summary This is the first report of whole-body nuclear magnetic resonance (NMR) imaging being of value in clinical surgery. Following aortobifemoral grafting, a 54-year-old man developed a pyrexia and hypotension which did not respond to antibiotic therapy and which was thought to be caused by e

The nuclear magnetic resonance imaging o

The nuclear magnetic resonance imaging of short t2 material using solid echoes

✍ J. J. Attard; P. J. McDonald 📂 Article 📅 1990 🏛 John Wiley and Sons 🌐 English ⚖ 482 KB

The application of solid echoes to the nuclear magnetic resonance (NMR) imaging of short Tz materials is demonstrated by means of two-dimensional ("F) images. A closed-form, exact and generally applicable expression for solid echo imaging is derived and a procedure for on-the-fly data analysis given

Magnetic resonance imaging of the uterin

Magnetic resonance imaging of the uterine cervix using an intravaginal coil

✍ C. J. Baudouin; W. P. Soutter; D. J. Gilderdale; G. A. Coutts 📂 Article 📅 1992 🏛 John Wiley and Sons 🌐 English ⚖ 402 KB 👁 1 views

## Abstract Cylindrical receiver coils designed for intravaginal use were utilized to image the uterine cervix. Good quality images of the cervix, vaginal wall, and parametrium were obtained and patient tolerance of the procedure was good. © 1992 Academic Press, Inc.

Use of ultrasound and magnetic resonance

Use of ultrasound and magnetic resonance imaging in the diagnosis of cervical pregnancy

✍ Birgit Bader-Armstrong; Yogesh Shah; Deborah Rubens 📂 Article 📅 1989 🏛 John Wiley and Sons 🌐 English ⚖ 347 KB 👁 1 views

Cervical pregnancy is a rare occurrence that may become a life-threatening situation. A cervical abortion has clinical and sonographic findings similar to a cervical pregnancy, and an accurate diagnosis is critical when making management decisions. This case demonstrates the sonographic criteria for

Monitoring of acutely III patients durin

Monitoring of acutely III patients during nuclear magnetic resonance imaging: Use of a Time-varying filter electrocardiographic gating device to reduce gradient artifacts

✍ Roxann Rokey; Richard E. Wendt; Donald L. Johnston 📂 Article 📅 1988 🏛 John Wiley and Sons 🌐 English ⚖ 380 KB

A time-varying filter electrocardiographic gating device designed to reduce NMR-induced gradient artifacts during NMR imaging of the acutely ill cardiac patient is described. When used in conjunction with multiple electrocardiographic display monitors, accurate assessment of the electrocardiogram fo

Dynamic imaging of the pelvic floor usin

Dynamic imaging of the pelvic floor using an open-configuration magnetic resonance scanner

✍ P. A. Law; J. C. Danin; G. M. Lamb; L. Regan; A. Darzi; W. M. Gedroyc 📂 Article 📅 2001 🏛 John Wiley and Sons 🌐 English ⚖ 262 KB 👁 1 views

## Abstract The aims of this study were to develop a noninvasive, erect, gravity‐dependent method for assessing movements of the female pelvic floor, to describe the range of movements in pelvic floor ascent and descent in asymptomatic and symptomatic women, and to quantify any differences. A total