[MSKI] MRI

This is a non-invasive imaging technology that produces three-dimensional detailed anatomic images. It is often used for disease detection, diagnosis, treatment, and monitoring, and is based on sophisticated technology that excites and detects the change in the direction of the rotational axis of protons found in the water that makes up living issues.

Magnetic Resonance Imaging

Fill in the Blanks: The MRI is a cross-sectional imaging technology that uses a ______ and ______ to cause ______ to emit their own signals which are converted into images by a computer.

Fill in the Blanks: The MRI is a cross-sectional imaging technology that uses a magnetic field and radiofrequency signals to cause hydrogen nuclei to emit their own signals which are converted into images by a computer.

These are the different processes related to the return of protons to alignment with the magnetic field.

Follow Up Question: Following the radiofrequency pulse, what are the two things that could happen?

T1 and T2 phenomena

• The protons gain longitudinal magnetization or realign with the magnetic field

• The protons lose their transverse magnetization

What determines the contrast between tissues in the images of an MRI?

• Difference in T1 and T2 and proton density

• Number of hydrogen nuclei in different tissues

This is the imaging protocols of events during image acquisition.

Sequence

What are the two parameters most important in creating contrast in the image?

• TR (Time to Repetition) — time at which the radiofrequency pulse is repeated again to displace the atoms

• TE (Time to Echo) — time at which the signal is captured