TNS FINAL- 4.0 Questions with Complete Solutions (Latest 2025)
JC 1- Imaging: 5-HTT genetic variation - Correct Answers
✅fMRI used to examine the differences in amygdala activity between those with one/two short alleles for the 5-HTT B0 - Correct Answers ✅electromagnetic radiofrequencies (magnetic field) transmitted out of one of machine's antennae protons absorb pulses -> precession Resonance and interference - Correct Answers
✅Resonance: external magnetic field forces protons into two
different orientations//unequal energy
parallel protons: with B0, constructive interference
cancels out...
antiparallel protons: against B0, destructive interference
Echo Time - Correct Answers ✅The time between the excitation pulse and the resulting echo collected in MRI Repetition time & noise - Correct Answers ✅more repetitions = less noise 1 / 2
TNS FINAL- 4.0 Questions with Complete Solutions (Latest 2025)
"What" and "where": examining MRI scans - Correct
Answers ✅Contrast- what type of tissue amount of energy released by a proton Dark vs. Light- where is the signal origin frequency of the energy released by a proton
T1 v T2 scans: lightest to darkest - Correct Answers
✅(1=whitest, 3=darkest) T1 SCAN- enhance signal of water
1. CSF
- gray matter
- white matter
T2 SCAN
- white matter
- gray matter
3. CSF
Block design- fMRI - Correct Answers ✅subject is presented with 2+ categories of stimuli that alternate every 1-2 minutes
- / 2