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Titolo:
MR-ANGIOGRAPHY OF THE HEART AND THORACIC VESSELS - APPLICATION OF FAST ECG-GATED TECHNIQUES WITH MULTIPLANAR RECONSTRUCTION CAPABILITY
Autore:
SEELOS KC; VONSMEKAL A; STEINBORN M; GIESEKE J; KAAS P; URBAN J; REDEL DA; REISER M;
Indirizzi:
UNIV MUNICH,KLINIKUM GROSSHADERN,INST RADIOL DIAGNOST,MARCHIONINISTR 15 D-81377 MUNICH GERMANY PHILIPS MED SYST HAMBURG GERMANY UNIV BONN,KINDERKLIN,KINDERKARDIOL ABT W-5300 BONN GERMANY
Titolo Testata:
Radiologe
fascicolo: 8, volume: 34, anno: 1994,
pagine: 454 - 461
SICI:
0033-832X(1994)34:8<454:MOTHAT>2.0.ZU;2-U
Fonte:
ISI
Lingua:
GER
Soggetto:
PULMONARY VASCULATURE; ARTERY STENOSIS; ABNORMALITIES; CHILDREN; DISEASE; AORTA; COILS;
Keywords:
MAGNETIC RESONANCE ANGIOGRAPHY; HEART; AORTA; PULMONARY ARTERIES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
24
Recensione:
Indirizzi per estratti:
Citazione:
K.C. Seelos et al., "MR-ANGIOGRAPHY OF THE HEART AND THORACIC VESSELS - APPLICATION OF FAST ECG-GATED TECHNIQUES WITH MULTIPLANAR RECONSTRUCTION CAPABILITY", Radiologe, 34(8), 1994, pp. 454-461

Abstract

Segmented 2D times-of-night (TOF) magnetic resonance angiography (MRA) with ECG gating is a suitable adjunct to conventional magnetic resonance tomography. Based on our experience with 106 patients, cardiovascular MRA primarily aids in the diagnosis of congenital heart disease, but is of minor importance for the evaluation of acquired cardiovascular disease, such as aortic aneurysms. Changes in flow dynamics as a result of spin dephasing may render partial signal loss. Due to now turbulence and resulting signal loss distal to stenoses, difficulties may arise in correctly determining the degree of stenosis and differentiating between partial thrombosis and slowly flowing blood. The most promising approach for optimizing 2D TOF MRA is enhancement of the intravascular signal and suppression of background signal. For the equipment we use with a 0.5 Tesla scanner, the most powerful combination to enhance intravascular signal and suppress background noise was applying a flip angle of 65 degrees and a short inversion prepulse. The influenceof the flip angle and prepulse on the intravascular signal varies, dependent on the flow velocities and heart rates. Secondary reconstructions, such as the MIP technique, contribute to better spatial orientation by using rotating projection views. To avoid overprojection artifacts and loss of diagnostic information, 2D single slices should be the primary source of image analysis.

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Documento generato il 29/09/20 alle ore 20:40:09