Armrit Questions and Answers(A+ Solution guide)

Electromagnetic energy is symbolized by a sine wave that has two components of measurements, they are: - Answer-Wavelength and frequency Of the following techniques which one is applied to prevent "crosstalk" between multi-slices with little or no interslice "gap" - Answer-Interleaving The artifact known as aliasing, wrap around or fold over will always show up in what gradient direction? - Answer-Phase encoding Which of the following causes of artifacts on MR images is most commonly mistaken for a pathological signal? - Answer-Chemical shift Substances which have magnetic properties of their own, such as, methemoglobin or gadolinium causes shortened T1 and T2 values for tissues in their vicinity are: - Answer-Paramagnetic Currently, there is no evidence of a threat to fetal development from MRI exposure. - Answer-True The formula that describes the relationship between the static magnetic field and the precessional frequency of the hydrogen protons is the _____ - Answer-Larmor equation Employing an inversion recovery pulse sequence with a water suppression technique a normal intervertebral disc will appear dark - Answer-True Of the following anatomical structure which is considered to be normally enhancing post gad injection? - Answer-Choroids plexus Aliasing occurs due to tissue outside of the selected field of view (FOV) being : - AnswerUndersampled The normal pituitary gland should appear bright following injection of a gadolinium enhancement agent - Answer-TrueIn conventional spin-echo imaging, each line of K-space is filled in each - Answer-TR period As the M vector returns to equilibrium, the MR signal grows weaker, this is called: - Answer-Free induction Decay Gad enhancement agents will readily pass through the normal blood brain barrier - Answer-False The temperature of the liquid helium in which the electromagnetic coil is immersed is approx: - Answer--436 degrees F RF pulses are identified according to the _________ - Answer-Flip angle