Aquifer - Radiology Exam | Questions With
Correct Answers | Latest Update
Window vs. Reconstruction on CT?
Reconstructions - processing of the raw CT data allows for better resolution of the
structures [higher resolution and higher contrast]
Reconstruction can be done in 3D (ortho) or in a linear way too (vascular)
What is the total range of hounsfield units available?
-1000 (air) to +1000 (metal) [so range is 2000]
What does a typical computer display show for greyscale range? What can the
human eye actually distinguish?
256shades (that means each shade of grey covers ~8HU)
The can only distinguish 17 shades of grey
What is a good way to check diaphragm flattening?
Look at the lateral film
,Diaphragm will be flat like you can set a ruler down on the edge
What can a poor inspiration/hypoinflation appear like?
consolidation or PNA
How to look at the lung fields?
Sweep or a zig zag down the lung field (both in PA and lateral views)
look for focal, diffuse, BL asymmetrical, Interstitial/vascular markings, lucencies
(cavity/bullae/PTX),
compare upper and lower and L/R zones
Middle
lower zones
Which hilum should always appear higher on the radiograph?
The LEFT sided hilum should be higher - if its not its pathological
What to look for with the heart?
,Size of the heart - the cadiac:thoracic cavity ratio
LA
LV
What mediastinal lines should be observed on PA film?
R paratracheal line
Azygous area
Azygoesophageal line
Paraaortic line (all the way down)
If you can see these you need to figure out the reason why
How to look at the bones on Xray?
Quadrant method [above and below the ribs] (the middle lung section you just
also go down the spine looking for abnormalities, mets, or collapse
When should you START looking at OLD films?
AFTER you have COMPLETELY evaluated the new scan
, What are the ACR appropriateness criteria?
The aim is to provide continuously updated evidence-based algorithms that
ensure the safest, most cost-effective, and most efficient path to radiological
diagnosis or intervention matched to specific variants of clinical presentations.
Federal LAW requires referring physicians to consult Appropriate Use Criteria
(AUC), such as ACR Appropriateness Criteria, prior to ordering advanced imaging
services (ADIS), including CT, MR, nuclear medicine, and PET, for Medicare
patients.
How are appropriateness criteria divided/staged?
Older appropriateness rating tables used a numerical rating scale: • Usually
Appropriate = 9, 8, or 7 • May be Appropriate = 6, 5, or 4 • Usually Not
Appropriate = 3, 2, or 1
Newer appropriateness rating tables simply use the three categories: • Usually
Appropriate (Green cells in the table) • May be Appropriate (Yellow cells in the
table) • Usually Not Appropriate (Red cells in the table)
What lobe of lung is seen at the apices?
The R and L upper lobes
What is the silhouette sign?
Correct Answers | Latest Update
Window vs. Reconstruction on CT?
Reconstructions - processing of the raw CT data allows for better resolution of the
structures [higher resolution and higher contrast]
Reconstruction can be done in 3D (ortho) or in a linear way too (vascular)
What is the total range of hounsfield units available?
-1000 (air) to +1000 (metal) [so range is 2000]
What does a typical computer display show for greyscale range? What can the
human eye actually distinguish?
256shades (that means each shade of grey covers ~8HU)
The can only distinguish 17 shades of grey
What is a good way to check diaphragm flattening?
Look at the lateral film
,Diaphragm will be flat like you can set a ruler down on the edge
What can a poor inspiration/hypoinflation appear like?
consolidation or PNA
How to look at the lung fields?
Sweep or a zig zag down the lung field (both in PA and lateral views)
look for focal, diffuse, BL asymmetrical, Interstitial/vascular markings, lucencies
(cavity/bullae/PTX),
compare upper and lower and L/R zones
Middle
lower zones
Which hilum should always appear higher on the radiograph?
The LEFT sided hilum should be higher - if its not its pathological
What to look for with the heart?
,Size of the heart - the cadiac:thoracic cavity ratio
LA
LV
What mediastinal lines should be observed on PA film?
R paratracheal line
Azygous area
Azygoesophageal line
Paraaortic line (all the way down)
If you can see these you need to figure out the reason why
How to look at the bones on Xray?
Quadrant method [above and below the ribs] (the middle lung section you just
also go down the spine looking for abnormalities, mets, or collapse
When should you START looking at OLD films?
AFTER you have COMPLETELY evaluated the new scan
, What are the ACR appropriateness criteria?
The aim is to provide continuously updated evidence-based algorithms that
ensure the safest, most cost-effective, and most efficient path to radiological
diagnosis or intervention matched to specific variants of clinical presentations.
Federal LAW requires referring physicians to consult Appropriate Use Criteria
(AUC), such as ACR Appropriateness Criteria, prior to ordering advanced imaging
services (ADIS), including CT, MR, nuclear medicine, and PET, for Medicare
patients.
How are appropriateness criteria divided/staged?
Older appropriateness rating tables used a numerical rating scale: • Usually
Appropriate = 9, 8, or 7 • May be Appropriate = 6, 5, or 4 • Usually Not
Appropriate = 3, 2, or 1
Newer appropriateness rating tables simply use the three categories: • Usually
Appropriate (Green cells in the table) • May be Appropriate (Yellow cells in the
table) • Usually Not Appropriate (Red cells in the table)
What lobe of lung is seen at the apices?
The R and L upper lobes
What is the silhouette sign?
