Flashcards in B2.003 Cardiac CT and MRI Deck (22):
What does CT stand for?
How does a CT work?
using beams of x-rays to measure tissue densities
List tissues found in CT by density and color.
air< fat < water< muscle < bone< contrast
What is the standard CT image display?
Axial, standing at foot of patient bed looking through their body
Can other planes be reconstructed from CT axial data?
What does MRI stand for?
magnetic resonance imagine
How does an MRI work?
using strong magnetic field and radiofrequency pulses to measure chemical properties of tissues
What are standard MRI image displays?
axial, coronal, sagittal 2D slices
Can other planes be reconstructed from MRI axial data?
no, each must be acquired separately
Compare the time it takes to get a CT vs MRI?
CT - seconds
MRI - >30 min
When is cadiac CT most useful?
Coronary artery eval
What do you see on cardiac CT without contrast?
Calcium deposits to get the calcium score
What do you see on cardiac CT with contrast?
plaque, stenosis, congenital anomalies
What is EKG gating?
time x-rays for diastole to reduce cardiac motion artifact
What are features of the right ventricle on a cardiac CT?
most anterior, closest to sternum
What are features of the left ventricle on a cardiac CT?
What are features of the right atrium on a cardiac CT?
receives IVC and SVC
What are features of the left atrium on a cardiac CT?
most posterior, closest to spine
L. Coronary artery features
arises from L. coronary sinus, divides into LAD and CX
LAD (L. anterior descending) features
through anterior interventricular groove, supplies anterior, apical, and septal regions of L. ventricle
CX (circumflex) features
through posterior atrioventricular groove, supplies free wall of L. ventricle