Thoracic imaging II Flashcards
How does MRI work
most of the body’s protons align within the larger magnetic field. Then radiofrequency pulses can be sent into the body, absorbed by the protons, emitted by the protons and finally detected by the MRI to produce an image
IV contrast for MRI
gadolinium, a rare earth metal with paramagnetic properties ideal for magnetic resonance. Gadolinium contrast allows for MR angiography imaging and MR enhanced imaging similar to iodinated IV contrast in CT.
When are daily ICU chest radiographs warranted
in pulmonary or unstable cardiac patients.
CXR, Ct and CT angiogram findings in pulmonary embolism
•Hamptons Hump: Peripheral infarct on chest radiograph. Pulm infarcts are uncommon though due to dual vascular supply. Pulm CT angiogram shows filling defect in pulmonary artery. CXR is usually normal but may show some consolidation
Preferred study to diagnose pulm embolism
CT angiogram
Radiographic findings in pulmonary edema
cardiomegaly, vascular redistribution, interstitial thickening (Kerley B lines), consolidations, pleural effusions.
Causes of consolidation/SOB in peripartum patient
Pneumonia, pulm embolism (thrombus or amniotic), pulmonary edema (meds, pre-eclampsia, cardiomyopathy)
Sillhouette sign
The silhouette sign is a fundamental concept in radiography where objects of equal density lose their differentiating borders when placed in contact with each other
Pneumonia radiographic findings
Silhouette sign results in a loss of the heart border, consolidation
Causes of acute consolidation of lung
HEAP: Hemorrhage, Edema, Alveolar Proteinosis, Pneumonia
Cardiac MRI after MI
Hypokinetic apical septum on cine images
Delayed subendocardial enhancement in the septum
Tracheobronchomalacia diagnosis
Dynamic expiratory CT imaging of trachea or bronchoscopy
