uMR 680

The uMR 680 is a 1.5T magnetic resonance diagnostic device designed to produce detailed anatomical and spectroscopic images for diagnostic purposes across various body regions. This iteration introduces a higher-channel Breast Coil for potentially improved breast imaging and integrates Magnetic Resonance Elastography (MRE) technology, including the `epi_se_mre` sequence, for quantitative tissue stiffness assessment, enhancing its diagnostic capabilities without altering its fundamental intended use.

The uMR 680 is a 1.5 Tesla superconducting magnetic resonance diagnostic device (MRDD) designed with a 70cm patient bore to generate cross-sectional (sagittal, transverse, coronal, oblique) and spectroscopic images. These images are utilized to visualize internal anatomical structures and functions of the head, body, and extremities, aiding trained physicians in diagnosis; contrast agents can be employed depending on the specific scan requirements. This document details modifications to the previously existing uMR 680, specifically the integration of a new 24-channel Breast Coil (Breast Coil-24) and the addition of Magnetic Resonance Elastography (MRE) capabilities, including the `epi_se_mre` pulse sequence. The indications for use for the modified device remain the same, focusing on producing images for diagnostic assistance. The scientific basis of the uMR 680 relies on the principles of magnetic resonance to acquire detailed images. The newly introduced Breast Coil-24 aims to enhance breast imaging through an increased number of receiver channels compared to a previous 10-channel coil, while maintaining equivalent intended use. The MRE functionality, including its `epi_se_mre` sequence, allows for non-invasive quantitative assessment of tissue stiffness, a valuable biomarker. Performance testing for these modifications encompassed surface heating, electrical and mechanical safety, Signal-to-Noise Ratio (SNR), uniformity, biocompatibility (with materials identical to those in a previously evaluated device for the Breast Coil), electromagnetic compatibility (EMC), and clinical image quality evaluations. All tests, including phantom and volunteer studies for MRE, demonstrated that the device performed as expected, with image quality deemed sufficient for diagnostic use by a U.S. Board Certified radiologist, ensuring the modifications did not introduce new safety or effectiveness concerns.

AI Regulatory Concerns

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Jev reads the full FDA letter and returns calibrated concern probabilities per regulatory category. These are AI estimates, not regulatory advice.

• Q1. How does the increased channel count (24 channels) of the new Breast Coil specifically improve diagnostic image quality (e.g., SNR, spatial resolution, scan time) for breast imaging compared to the previous 10-channel coil?; What specific clinical scenarios or pathologies is the newly integrated Magnetic Resonance Elastography (MRE) feature primarily intended to evaluate, and what range of stiffness values can it reliably quantify?; Are there any changes to the image reconstruction algorithms or post-processing software associated with the introduction of the Breast Coil-24 and the MRE/epi_se_mre sequence?; What were the key performance metrics (e.g., accuracy, repeatability, reproducibility) from the phantom and volunteer studies for the MRE functionality, and how do these compare to established MRE systems?; Does the `epi_se_mre` sequence offer any specific advantages or overcome limitations compared to other MRE pulse sequences used in clinical practice?