The Guglielmi detachable coil, a platinum microcoil used in the endovascular treatment of intracranial aneurysms, was studied in vitro for its MR imaging artifacts, heat production, and ferromagnetism. In addition, imaging artifacts were studied in vivo in eight patients who had undergone therapeutic placement of these coils. These devices displayed a very low level of MR artifact and no ferrom...

Consistent high quality MR imaging of the fingers and toes present a challenge for even the newest of high performance MR technologies. Consistent delineation of fine anatomic detail is accomplished utilizing small fields of view, high performance high field strength MRI systems and dedicated quadrature coils. Referrals from hand surgeons and foot surgeons for MR imaging of the fingers and toes...

PURPOSE To obtain robust estimates of (31) P metabolite content in mouse skeletal muscles using our recently developed MR absolute quantification method and a custom-built (1) H/(31) P dual tuned radiofrequency (RF) coil optimized for mouse leg. MATERIALS AND METHODS We designed and fabricated a probe consisting of two dual tuned (1) H/(31) P solenoid coils: one leg was inserted to each solen...

The purpose of the study was to evaluate the effect of attenuation of MR coils on quantitative carotid PET/MR exams. Additionally, an automated attenuation correction method for flexible carotid MR coils was developed and evaluated. The attenuation of the carotid coil was measured by imaging a uniform water phantom injected with 37 MBq of 18F-FDG in a combined PET/MR scanner for 24 min with and...

The process to produce an MR image includes nuclear alignment, RF excitation, spatial encoding, and image formation. In simple terms, an magnetic resonance imaging (MRI) system consists of five major components: a magnet, gradient systems, an RF coil system, a receiver, and a computer system. To form an image, it is necessary to perform spatial localization of the MR signals, which is achieved ...

Although high-resolution MRI with phased array pelvic, endorectal, and endovaginal coils has dramatically enhanced the ability to visualize abnormalities of the female urethra and periurethral tissues, controversy still remains about the anatomy of this region. This study introduces an endourethral approach for ultra-high-resolution MRI of the female urethra and the periurethral tissues. To thi...

Magnetic Resonance Imaging (MRI) is a powerful non-invasive reconstruction tool used primarily in the medical community to produce high quality images of the human anatomy. Surface coils are Radio Frequency (RF) systems typically deployed for receiving the MR signals. Multiple surface coils, or an array of coils, are employed to obtain a localized improvement in the signal-to-noise ratio withou...

Introduction: Magnetic Resonance Microscopy (MRM) has become an important tool for in-vivo microscopy and in-vitro/exvivo histology [1,2]. One challenge is that very small RF coils are used to obtain high signal-to-noise ratio in small voxel sizes. These small coils limit the field-of-view, necessitating the use of arrays or multiple studies. In this abstract, the extension of our previous work...