Which MRI pulse sequence provides proton density contrast?

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Multiple Choice

Which MRI pulse sequence provides proton density contrast?

Explanation:
The main idea is that proton density weighting isolates the amount of mobile hydrogen protons in tissue, rather than how quickly or slowly they relax. To achieve this, a proton-density weighted image uses a long repetition time so T1 effects are minimized and a short echo time to reduce T2 effects. With those settings, the image contrast mainly reflects how many protons are present in different tissues. So tissues with higher proton density appear relatively brighter, while those with fewer protons appear darker, providing clear anatomical detail. The other sequences emphasize relaxation properties—T1 weighting highlights differences in T1 recovery, T2 weighting emphasizes T2 decay, and STIR suppresses fat to make edema and fluid differences more conspicuous.

The main idea is that proton density weighting isolates the amount of mobile hydrogen protons in tissue, rather than how quickly or slowly they relax. To achieve this, a proton-density weighted image uses a long repetition time so T1 effects are minimized and a short echo time to reduce T2 effects. With those settings, the image contrast mainly reflects how many protons are present in different tissues. So tissues with higher proton density appear relatively brighter, while those with fewer protons appear darker, providing clear anatomical detail. The other sequences emphasize relaxation properties—T1 weighting highlights differences in T1 recovery, T2 weighting emphasizes T2 decay, and STIR suppresses fat to make edema and fluid differences more conspicuous.

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