What is the difference between a CT and an MRI?

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Your focus is on radiation therapy, but having a broader knowledge of the machines that produce imaging, like a CT scan or an MRI, is also important. Doctors use these tools to help them to identify precisely where the radiation needs to be applied. A CT scan uses X-rays to create detailed images of the inside of the body, while an MRI uses a strong magnetic field and radio waves to generate images. CT scans are often used to evaluate bone and lung conditions, while MRIs are preferred for examining soft tissues such as the brain, spinal cord, and joints. Both imaging tests can help diagnose a variety of conditions. Be sure to familiarize yourself with any specific medical terminology that may come up during your interview. Then, describe the differences between the two, showing the interviewer you understand the different machines used in the medical field.

"An MRI does not use x-rays or radiation, and it is often used to produce imaging of the brain. A CT scan takes multiple images from different angles to allow you to see layers of a section of the body."

"Often, abnormalities are easier to see on an MRI versus a CT, but the scans are different, making these two forms of imaging very complimentary to each other. CT scans use X-rays, while MRI scans use magnetic fields and radio frequency pulses."

Anonymous Answer

"MRI does not use ionizing radiation to collect the images and can help view the brain. CT scan uses ionizing radiation to produce images."

Rachelle's Feedback

Good! Your ability to clearly explain these concepts will show the interviewer just how well you can relay information to your patients.

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Anonymous Answer

"Both CT and MRI provide structural information, however, MRI provides much greater soft tissue detail. CT uses ionizing radiation to acquire images at set intervals based on slice width. The images produced correspond to varying tissue density across each transverse slice. An MRI however uses magnetic fields and radiowaves to generate an image of the patient's anatomy."

Rachelle's Feedback

This is a great response! You give a straightforward answer that any patient would be able to understand.

Anonymous Answer

"CT offers low-energy x-rays causing photoelectric effect interaction in the body to view bone anatomy on our computer screens. Commonly used in radiotherapy planning and localization imaging (CBCT) as it is quick and cost-effective.

MRI is using magnets to generate detailed images of soft tissues, commonly used during diagnostics. Sometimes during localization imaging. Although it is costly and more time-consuming."