Magnetic Resonance Imaging (MRI) Board Practice Exam

Proton Density weighting emphasizes which tissue property?

Proton density Fat content Water content Magnetic susceptibility

Correct Answer:

Proton density

Explanation:

Proton density weighting emphasizes the number of mobile hydrogen protons present per unit volume in tissue. In practice, this is achieved by using a long repetition time to minimize T1 effects and a short echo time to minimize T2 differences, so the image contrast mostly reflects how many protons are available to produce signal rather than how quickly they relax. Therefore tissues with more hydrogen protons—typically water-rich areas like CSF or edema—appear brighter, while tissues with fewer protons appear darker. Magnetic susceptibility and relaxation-time effects are not the primary drivers of PD-weighted contrast.

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