Choose the correct option from a e and explain why this is

Choose the correct option from (a) - (e) and explain why this is your choice. The maximum MR signal is obtained by using: 90 degree RF pulse, short TE, and short TR; 45 degree RF pulse, short TE, and short TR; 90 degree RF pulse, short TE, and long TR; 90 degree RF pulse, long TE, and short TR; 45 degree RF pulse, long TE, and short TR.

Solution

option: C

90⁰RF pulse, short TE and long TR

this combination is known as proton density-weighted and it is chosen because all MR scans image contrast depends on proton density only. this combination will give better image qaulity than any other combinations given above.

here

TE-Echo time: is the time between 90 degree RF pulse and MR signal sampling that corresponds to maximum echo.

TR-repition time is the time between 2 excitation pulses.