ARMRIT Exam 2 |Revised Study Guide| Graded A+

ARMRIT Exam 2 |Revised Study Guide| Graded A+ 2DFT *Ans* When selecting only one slice at a time during a pulse sequence, which method for providing spatial localization is employed? Higher relaxation rates *Ans* Tissues that have low (short) relaxation times have: Increase resolution *Ans* For the following spin-echo protocol: FOV: 320 / TR: 500 / TE: 25 / SliceThick: 5mm / Slice Gap: 1mm/ Slice#: 9 / NEX: 4 / Matrix: 192 -- Increasing Matrix will: Toxicity *Ans* Combining a metal ion with a ligand reduces their tendency to bind to proteins, enzymes or membranes. The degree to which they dissociate is a measure of their: Bloch equation *Ans* A complicated equation for predicting the MR signal intensity from a tissue subject to a spin-echo sequence is the: Choroid plexus *Ans* Which is a normally enhancing structure after the administration of MRI I.V. gadolinium? Jean-Baptiste-Joseph Fourier *Ans* Who described the mathematical method for converting a time-varying signal into its frequency components, which are used to obtain positional information from the MR signal? 4 mins *Ans* Using the following protocol, determine the scan time for this pulse sequence: (round off your answer to the nearest minute.) FOV: 320mm / TR: 2000ms / TE: 20/80ms / NEX: 1 / Matrix: 256x128 To decrease T2 relaxation time, thus emitting LOW signal *Ans* The two types of enhancement media, described by Lauffer, the mechanism of T2 agents is: Gy *Ans* In spatial localization, the "logical" phase encoding gradient is symbolized? Increase SNR and Resolution *Ans* For the following spin-echo protocol: FOV: 320 / TR: 500 / TE: 25 / SliceThick: 5mm / Slice Gap: 1mm/ Slice# 9 / NEX: 4 / Matrix: 192 ; Increasing NEX will: Slice position *Ans* Information acquired when you increase or decrease the frequency of the RF pulse of the Gs, causing the center of the excited place to change with the