Evaluation of internal MRI coils using ultimate intrinsic SNR.
نویسندگان
چکیده
The upper bounds of the signal-to-noise ratio (also known as the "ultimate intrinsic signal-to-noise ratio" (UISNR)) for internal and external coils were calculated. In the calculation, the body was modeled as a dielectric cylinder with a small coaxial cylindrical cavity in which internal coils could be placed. The calculated UISNR values can be used as reference solutions to evaluate the performance of internal MRI coils. As examples, we evaluated the performance of a loopless antenna and an endourethral coil design by comparing their ISNR with the UISNR.
منابع مشابه
Ultimate intrinsic signal-to-noise ratio in MRI.
A method to calculate the ultimate intrinsic signal-to-noise ratio (SNR) in a magnetic resonance experiment for a point inside an arbitrarily shaped object is presented. The ultimate intrinsic SNR is determined by body noise. A solution is obtained by optimizing the electromagnetic field to minimize total power deposition while maintaining a constant right-hand circularly polarized component of...
متن کاملOptimization of Internal MRI Coils Using Ultimate Intrinsic SNR
Introduction Internal coils are widely used in MRI applications for both diagnostic and interventional studies [1]. Their high SNR characteristics make them more preferable in certain applications when compared to conventil external coils. Although many studies exist for the optimization of external coils to obtain increased SNR, an optimization study for internal MRI coils can also be made. In...
متن کاملNon-uniformity of Clinical Head, Head and Neck, and Body Coils in Magnetic Resonance Imaging (MRI)
Introduction Signal intensity uniformity in a magnetic resonance (MR) image indicates how well the MR imaging (MRI) system represents an object. One of the major sources of image non-uniformity in high-field MRI scanners is inhomogeneity of radio-frequency coil. The aim of this study was to investigate non-uniformity in head, head and neck, and body coils and compare the obtained results to det...
متن کاملA Closed-Form Expression for Ultimate Intrinsic Signal-to-Noise Ratio in MRI
INTRODUCTION In magnetic resonance imaging (MRI), an increase in signal to noise ratio (SNR) provides higher quality images, making diagnosis easier, thus it should be maximized. The main noise sources in an MRI experiment are classified as preamplifier, coil and body noises. Preamplifier noise is small when ultra-low-noise amplifiers (ULNA) are utilized. Coil noise is also small in most applic...
متن کاملPhased-array MRI of canine prostate using endorectal and endourethral coils.
A four-channel phased array consisting of one surface coil, two endorectal coils, and one flexible endourethral loop coil was designed for MRI of the canine prostate. The endorectal coils provide high signal in the posterior region of the prostate, while the endourethral and surface coils are sensitive to the central and anterior regions of the prostate. Gel phantom experiments indicate that th...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
- Magnetic resonance in medicine
دوره 52 3 شماره
صفحات -
تاریخ انتشار 2004