Introduction It has been shown that both MRI and MRS can improve specificity in the detection of prostate cancer [1]. During MR-guided prostate biopsies suspect prostate areas can be identified on T2w MR images, and MRS metabolic information can further help to decide from which areas biopsy samples need to be harvested. Since the quality of MR data crucially depends on the local signal-to-nois...

INTRODUCTION Neonatal MR is a particularly challenging application requiring fast imaging to reduce motion artifacts especially when anaesthetics are not used. However, on conventional MR system fast imaging sequences produce high levels of acoustic noise and can yield high SAR. Increased SNR and gradient strength can be achieved while obeying acoustic noise and SAR restrictions using smaller s...

In one volunteer, five breast coils were evaluated for signal-to-noise ratio (SNR), uniformity, comfort, subject orientation, access to the breast, and unilateral imaging options. The four-coil arrays provided superior SNR, imaging flexibility, and access. Uniformity and comfort were issues with all coils. Substantial design differences exist between coils; purchasers should ensure that their s...

Receive coils are one of the most challenging components of the MR system, not only from a technical perspective but also because they are one of the few components in direct contact with the patient containing active electronic circuits. The proximity of the coil to the patient is a fundamental aspect in coil design, which is very often only associated to electronic design. During the past 15 ...

Magnetic resonance imaging is a noninvasive technique that has been developed for its excellent depiction of soft tissue contrasts. Instruments capable of ultra-high field strengths, ≥7 Tesla, were recently engineered and have resulted in higher signal-to-noise and higher resolution images. This paper presents various subsystems of the MR imaging systems like the magnet subsystem, gradient subs...

Hyperpolarized 13C Magnetic Resonance (MR) is a promising technique for in vivo non-invasive assessment of metabolism humans. Despite the considerable signal increase provided by hyperpolarization techniques, low molar concentration derivate metabolites gives rise to technological limits terms data quality. The development dedicated radio frequency coils, capable providing large field view with...

PURPOSE In integrated linac-MRI systems, the RF coils are exposed to the linac's pulsed radiation, leading to a measurable radiation induced current (RIC). This work (1) visualizes the RIC in MRI raw data and determines its effect on the MR image signal-to-noise ratio (SNR) (b) examines the effect of linac dose rate on SNR degradations, (c) examines the RIC effect on different MRI sequences, (d...

The wide variety of available surface coils, pulse sequences, and post-processing techniques make MR imaging a useful clinical and research tool for evaluation of pelvic floor relaxation. Cases of isolated cystocele do not require imaging; however, in cases in which multiple compartments of the pelvis are involved or the patient has failed prior surgery, MR imaging should be considered for preo...

The purpose of this study was to develop coils for MR imaging of the head and neck region, with the aim of improving sensitivity and coverage. A head and neck phased array coil was constructed and compared with volume and temporomandibular joint surface coils for sensitivity and coverage in phantom studies. An algorithm was implemented to correct for the nonuniformity in the surface coil recept...

before (left) and after (right) signal intensity correction. The images of the other 2 rats were simultaneously obtained and were of comparable quality (not shown). Fig.1. Sixteen-channel coil dedicated for small animal MRI. An array comprises 8 5-cm-circular coils (a). The 16-channel coil has 2 sets of 8-array coils in the upper and lower parts (b). A white bar on the top is used to adjust the...