unit 6 Flashcards
first branch from the abdominal aorta
celiac trunk
second branch off the abdominal aorta
superior mesenteric artery
we may scan pediatrics and pregnant patient abdomens for
appendicitis
equipment used in abdominal MRI imaging
body coil
bellows
headphones/earplugs
bellows attach around the patients to
monitor breathing
horizontal alignment light should pass through the level of the
third lumbar vertebrae, or lower costal (rib cage) margin
abdominal coronals are prescribed
from the posterior abdominal muscles to the anterior abdominal wall
the abdominal coronal FOV at minimum should include
from the diaphragm down through the kidneys
abdominal axials should cover the area of interest from
superior to inferior
possible artifacts for abdominal imaging
- breathing motion
- peristalsis
- inconsistent breathing
to help eliminate breathing artifacts use
- parallel imaging
- respiratory techniques
- a “navigator” can be used
what divides the liver into right & left lobes
falciform ligament
T/F: the patient is the largest source of field inhomogeneities and susceptibility artifacts in a scan
true
what term is used for something that is applied to refocus the de-phasing after the excitation pulse?
gradient
what are the only 2 kinds of pulse sequences in MRI
GRE & SE
which sequence do you typically run for brains to look for hemorrhage?
GRE
T/F: all pulse sequences start off with an excitation RF pulse and a slide gradient applied at one right after another
false
what is the order of the gradients of how things occur for each slice?
(first to last)
- slice
- phase
- frequency
T/F: a flip angle that produces the maximum signal and T1 contrast is called the Ernst angle
true
what is the “back bone” of MR scanning
SE
T/F: both the SE & GRE are very similar, it is the lack of a 180 degree RF pulse in GRE that is the major difference
true
what is given to the patient to drink before an MR enterography
barium contrast
T/F: the MRCP is used to visualize the biliary duct & the pancreatic duct
true
for abdomen scanning, the superior portion of the axial slices should be
superior to the liver/diaphragm dome
