the SNR by adding a

Birth of the Coil: another Milestone towards a fully reproducible low-field MRI scanner for head-imaging

This work presents an open-source, optimized solenoid head coil tailored for the 50 mT open-source scanner (OSII ONE v2.1), set the basis for a fully reliable and reproducible component for the open-source OSII ONE MRI scanner.

City Research

Inductively Coupled Wireless Coils for Magnetic Resonance Imaging: A Review.

This review elaborates on the inductive coupling mechanism of ICWCs, the derivation of the SNR formula, potential causes of g-factor reduction, and recommendations for fabrication methods, providing a reference for the innovation of MRI RF coil technology and the clinical translation of ICWCs.

Numerical Analysis of the Comprehensive Performance of Straight Dipole Arrays for 11.74 T MRI Brain Imaging

The use of ultra-high magnetic fields, such as 11.74 T in magnetic resonance imaging (MRI), offers great potential for achieving superior image quality and enabling advanced imaging applications. The development of new field-strength systems requires an investigation into the performance of radiofrequency transmitters and receivers. Loop coils are a popular choice for MRI scanners up to 7 T, with better performance exhibited at 3 T, whereas volume coils such as birdcage coils are preferred for 1.5 T scanners. On this basis, the field strength of 11.74 T raises the question of which resonator design will provide superior performance. Dipole antennas have been proposed for many applications involving different field strengths and target organs. One of the limitations of dipole antennas is the relationship between the resonance and the length. At 11.74 T, the dipole frequency of operation is 500 MHz, which provides a dipole antenna length of approximately 28 cm, which is acceptable for an MRI scanner. This study analyzed the transmission and reception performances of dipole arrays with different radii in terms of field intensity, uniformity, SAR, effectiveness, g-factor, and field optimization.

Utility of signal enhancement ratio on DCE-MRI for detection of residual breast cancer following surgery or neoadjuvant chemotherapy – a pilot study

Accurate detection of residual disease following breast-conserving surgery or neoadjuvant chemotherapy is essential for appropriate treatment planning in breast cancer. This retrospective pilot study aimed to evaluate the utility of the signal enhancement ratio (SER), a quantitative parameter derived from dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI), in detecting residual malignancy. Fourteen women who underwent 3T bilateral breast DCE-MRI at a tertiary care centre in central India were included. SER maps were generated using voxel-wise calculations, and regions of interest were placed on areas of maximum enhancement. Residual disease was confirmed histologically in 4 patients and excluded in 10 patients (8 by histopathology, 2 by long-term follow-up). Median SER was significantly higher in residual disease (136.2) compared to non-residual cases (44.0, p < 0.05). Morphological features showed high sensitivity (100%) but low specificity (50%). An SER cut-off of 90 improved specificity to 90% without loss of sensitivity. SER mapping may enhance diagnostic accuracy in post-treatment breast MRI, supporting its use as a quantitative adjunct.

Ultra-Low-Field Brain MRI for Point-of-Care Applications: A Technology Review.

The recent developments in ultra-low-field brain MRI are reviewed, which enable imaging in open environments and demonstrate initial clinical applicability in point-of-care settings, and future developments are envisioned to address the current limitations of image quality and contrast in ultra-low-field brain MRI systems.