An implant has been tested on a 1.5T and it deflects 90 degrees. What is the level of risk if the same implant is placed in a patient's cerebral arteries?

When assessing the risk of an implant that deflects 90 degrees in a 1.5T magnetic field, especially when considering its placement in a patient's cerebral arteries, it is critical to understand the implications of that deflection. A 90-degree deflection suggests that the implant is significantly affected by the magnetic field strength, indicating a strong interaction between the implant material and the MRI magnet. This is particularly concerning in a sensitive and critical area like the cerebral arteries, where precise positioning of vascular implants is crucial for safety and effectiveness.

The high degree of deflection raises concerns about the potential for the implant to move or become dislodged during an MRI procedure, possibly resulting in harmful consequences such as obstruction of blood flow, damage to vascular structures, or even embolization. These outcomes can lead to serious complications such as stroke or ischemia. Since the implant has already demonstrated unstable behavior in an established magnetic field environment, the effect of MRI could exacerbate these dangers significantly in the cerebral arteries, where conditions are already delicate.

Thus, the risk level of placing such an implant in cerebral arteries is categorized as high, as it poses significant hazards during an MRI scan that could jeopardize patient safety.