What does gradient slew rate measure?

The gradient slew rate is defined as the rate at which the magnetic field gradient can change over time, typically expressed in millitesla per meter per second (mT/m/s). This measurement is crucial in magnetic resonance imaging (MRI) because it affects spatial resolution and imaging speed. A higher slew rate allows for faster switching of the gradient fields, which facilitates rapid imaging sequences and improves the system's ability to capture high-resolution images of dynamic processes.

In practical terms, the gradient slew rate impacts the ability of the MRI system to handle quick changes in gradient strength without introducing artifacts or image degradation. This plays a vital role when imaging moving structures, such as the heart or when performing functional MRI.

The other options relate to significant aspects of MRI technology but do not define the gradient slew rate effectively. While time taken to achieve full gradient strength is related to the performance characteristics of the gradient system, it does not define the slew rate itself. Frequency response involves how the gradient can respond to different frequencies but is not specifically about the definition of slew rate. Temperature stability pertains to the management of thermal effects in the gradient coils, which can impact overall performance but is not what the slew rate measures.