Cinematic study of temporomandibular joint motion using ultra-fast magnetic resonance imaging.

Magnetic Resonance Images (MRI) of the temporomandibular joint (TMJ) are usually performed to study the opening/closing movements of the mandible and have up to now been pseudodynamic step-by-step images simulating condylar motion by post-processing reconstruction. The aim of this study was: 1. to optimize a TMJ cine-imaging method to give a better clinical result than the step-by-step methods; 2.

Gadolinium-enhanced MR imaging of normal renal transplants. An evaluation of a T1-weighted dynamic echo-planar sequence.

Purpose: To evaluate the potential usefulness of dynamic MR with echoplanar imaging (EPI) in assessing the renal function in patients with renal allografts.

Material And Methods: Using a T1-weighted sequence, EPI was performed after injection of a Gd-chelate in 17 patients with normally functioning renal allografts. Time-intensity curves were plotted from the signal intensity (SI) measurements of the cortex and the medulla.

Polylysine-Gd-DTPAn and polylysine-Gd-DOTAn coupled to anti-CEA F(ab')2 fragments as potential immunocontrast agents. Relaxometry, biodistribution, and magnetic resonance imaging in nude mice grafted with human colorectal carcinoma.

Rationale And Objectives: Immunocontrast agents used for magnetic resonance imaging require antibodies that preserve the immunoreactivity while containing a high number of chelated paramagnetic ions.

Methods: Anti-CEA F(ab')2 fragments were coupled to polylysine-Gd-DOTA and polylysine-Gd-DTPA. A paramagnetic load as high as n = 24 to 28 metal ions per antibody was reached.

[The evaluation of 3DFT time-of-flight MR-angiography versus angiography in the study of carotid atheromatous lesions with a review of the literature].

In 37 patients suspected of having a stroke 71 carotid bifurcations were explored by MR-angiography and by digital angiography the reference technique. A 3D sequence was acquired with the time-of-flight technique, using a transmitter-receiver cranial coil, followed by a strictly receiver Helmoltz coil on a 1 Tesla magnet. Two examiners evaluated the carotid bifurcations and measured the degree of stenosis in terms of diameters, according to the north american symptomatic carotid endarterectomy trial (NASCET).

Contribution of MR-angiography to the diagnosis and the therapeutic indication and follow-up of intracranial aneurysms.

The purpose of this study was to evaluate MR-Angiography (MRA) in comparison with digital angiography in the diagnosis, therapeutic indication and therapeutic follow-up of cerebral aneurysms. Out of 27 patients explored by angiography and MRA, 17 had aneurysm, 5 had an aneurysm excluded by a detachable balloon, and 5 without aneurysm were used as controls. MRA, performed by the paradoxical enhancement technique, required a 3 DFT acquisition with short TR and TE (40-8 ms) in gradient echo, with a 15 degrees flip angle.