Cervical spine MR imaging using multislice gradient echo imaging: Comparison with cardiac gated spin echo

The authors evaluated partial anomalous pulmonary venous return by magnetic resonance (MR) images. Seven patients with this congenital anomaly underwent MR imaging examination. Conventional spin-echo and gradient-echo imaging were performed. In addition, during acquisi tion of gradient-echo images, saturation pulses were imposed on the affected lung. Spin-echo images showed the anatomical situation of the anomalous veins, and gradient-echo images revealed the blood flow in the veins. With saturation technique, the direction and drainage of blood flow in the anomalous veins were well defined. The study suggests that MR imaging with spin-echo method and gradient-echo method with or without saturation pulses is a useful and noninvasive method of diagnosing partial anomalous pulmonary venous return. MR images with spin- and gradient-echo methods were useful in defining the anatomical situation and blood flow in the anomalous veins. By imposing saturation pulses on the affected lung field, the direction and drainage of blood flow in the anomalous veins were clearly demonstrated.

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MR Imaging of Articular Cartilage: Comparison of Magnetization Transfer Contrast and Fat - Suppression inMultiplanar and 3D Gradient-Echo, Spin-Echo, Turbo Spin-Echo Techniques

Journal of the Korean Radiological Society ◽

10.3348/jkrs.1999.40.3.577 ◽

1999 ◽

Vol 40 (3) ◽

pp. 577

Author(s):

Young Joon Lee ◽

Eun Young Joo ◽

Choong Ki Eun

Keyword(s):

Articular Cartilage ◽

Mr Imaging ◽

Spin Echo ◽

Magnetization Transfer ◽

Fat Suppression ◽

Turbo Spin Echo ◽

Gradient Echo ◽

Magnetization Transfer Contrast ◽

Turbo Spin

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Experimental intracerebral and subarachnoid/intraventricular haemorrhages: MR detectability at 0.5 T and 1.5 T

Acta Radiologica ◽

10.1258/rsmacta.43.5.464 ◽

2002 ◽

Vol 43 (5) ◽

pp. 464-473

Author(s):

M. Alemany Ripoll ◽

R. Raininko

Keyword(s):

Cerebrospinal Fluid ◽

Mr Imaging ◽

Spin Echo ◽

Autologous Blood ◽

Pulse Sequences ◽

Proton Density ◽

Gradient Echo ◽

The Brain ◽

Formalin Fixed

Purpose: To compare the detectability of small experimental intracranial haemorrhages on MR imaging at 0.5 T and 1.5 T, from hyperacute to subacute stages. Material and Methods: 1 ml of autologous blood was injected into the brain of 15 rabbits to create intraparenchymal haematomas. Since the blood partially escaped into the cerebrospinal fluid (CSF) spaces, detectability of subarachnoid and intraventricular blood was also evaluated. MR imaging at 0.5 T and at 1.5 T was repeated up to 14 days, including T1-, proton density- and T2-weighted (w) spin-echo (SE), FLAIR and T2*-w gradient echo (GE) pulse sequences. The last MR investigation was compared to the formalin-fixed brain sections in 7 animals. Results: The intraparenchymal haematomas were best revealed with T2*-w GE sequences, with 100% of sensitivity at 1.5 T and 90–95% at 0.5 T. Blood in the CSF spaces was significantly ( p < 0.05) better detected at 1.5 T with T2*-w GE sequences and detected best during the first 2 days. The next most sensitive sequence for intracranial blood was FLAIR. SE sequences were rather insensitive. Conclusion: 1.5 T equipment is superior to 0.5 T in the detection of intracranial haemorrhages from acute to subacute stages. T2*-w GE sequences account for this result but other sequences are also needed for a complete examination.

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