Evaluation of magnetic resonance sequences in imaging mediastinal tumors

Journal Article · Mon Oct 01 04:00:00 EDT 1984 · AJR, Am. J. Roentgenol.; (United States)

DOI:https://doi.org/10.2214/ajr.143.4.723· OSTI ID:6385579

Webb, W R; Gamsu, G; Stark, D D; Moon, Jr, K L; Moore, E H

Ten patients having a mediastinal tumor were studied with magnetic resonance imaging (MRI) using from two to four imaging sequences. Seven had bronchial carcinoma and three had benign lesions. The sequences included the spin-echo technique with repetition time (TR) values of 0.5, 1.0, and 2.0 sec and echo time (TE) values of 28 and 56 msec, and the inversion-recovery technique. The signal-intensity ratios of the mediastinal mass and mediastinal fat, which are a measure of image contrast, were compared for the different imaging sequences. Also signal-to-noise ratios were measured relative to both mediastinal fat and mediastinal mass. With spin-echo imaging, decreasing the TR value resulted in an increase in mass/fat contrast in all patients, making the masses easier to detect, but this also resulted in decreased signal-to-noise ratios. Inversion-recovery imaging with the sequence used resulted in a greatly increased mass/fat contrast, because of a relative decrease in signal from the mass. Spin-echo imaging with both short and long TR values provides good tissue contrast and good signal-to-noise ratios.

• Research Organization: Univ. of California Medical Center, San Francisco
• OSTI ID: 6385579
• Journal Information: AJR, Am. J. Roentgenol.; (United States), Journal Name: AJR, Am. J. Roentgenol.; (United States) Vol. 143:4; ISSN AAJRD
• Country of Publication: United States
• Language: English

Related Subjects

550602* -- Medicine-- External Radiation in Diagnostics-- (1980-)
62 RADIOLOGY AND NUCLEAR MEDICINE
ADIPOSE TISSUE
ANIMAL TISSUES
BLOOD VESSELS
BODY
BODY AREAS
CARCINOMAS
CARDIOVASCULAR SYSTEM
CHEST
CONNECTIVE TISSUE
DISEASES
IMAGES
MAGNETIC RESONANCE
MEDIASTINUM
NEOPLASMS
ORGANS
PATIENTS
RESONANCE
RESPIRATORY SYSTEM
SIGNAL-TO-NOISE RATIO
SPIN ECHO
TISSUES
TRACHEA