Radiology 3: Thoracic imaging Flashcards
options for imaging?
CXR US fluoroscopy CT VQ PET CT MRI
what is the radiation for CXR?
0.014mSv
what are the outcomes of having a AP CXR?
cardiac magnification, rotation, lordosis, poor inspiration, scapula
what are the indications for US?
safe pleural drainage
diaphragm function
pleural and peripheral lung biopsy
fluoroscopy indications?
NG tube placement
CT indications
CTPA HRCT Staging lung - lung cancer tracheal imaging lung/mediastinal biopsy occasional pleural drain placement tumour ablation
V/Q scan indications
PE if:
pregnant
allergy to iodine contrast
cons of V/Q?
less available
limited additional information
What score is used for PE ?
Wells Score Clinical signs/symptoms of DVT 3 PE is the most likely diagnosis 3 Tachycardia >100bpm 1.5 >3 days immobility or surgery in the last month 1.5 Previous DVT/PE 1.5 Haemoptysis 1 Malignancy 1 Clinical probability PE likely >4 points PE unlikely 4 or less points
what should we advise patients 6 hours before PET/CT
only water 6 hours before
how does PET CT work?
uptake of glucose.
when should PETCT be avoided?
pregnant women, young children, claustrophobic
MRI indications
cardiac mostly apical lung tumour paravertebral lesions thymic hyperplasia PE in pregnancy
what is the silhouette sign?
looking for loss of silhouette when there is touching structures of the same density.
Can identify pneumonia, lobar collapse and masses.
how can we tell alveolar shadowing?
fluffy
ill defined margins
lobar or segmental
air bronchograms
