Radiology

Question 1

Different densities on a CXR?

Answer 1

Air
Fat
Muscle/Soft tissue
Metal 
Bone

Question 2

Air colour in CXR

Answer 2

Black

Question 3

Fat colour in CXR

Answer 3

Grey

Question 4

Soft Tissue/Muscle in CXR

Answer 4

Grey/white

Question 5

Metal in CXR

Answer 5

Bright White

Question 6

Bone in CXR

Answer 6

White

Question 7

What fluid and soft tissue do in a CT scan?

Answer 7

Allows passage of sound waves
Fluid- black
Soft tissue- white

Question 8

What does air and bone do in a CT scan?

Answer 8

Blocks passage of sound waves

Shadow

Question 9

CXR PA technique

Answer 9

• Patient stands 2m away from x- ray apparatus
• Shoulders braced forward to prevent scapulae obscuring lungs
• Radiograph taken at full inspiration
• PA view minimizes magnification of cardiac shadow

Question 10

CXR AP technique?

Answer 10

• Cassette is placed behind patient and X rays pass from A to P
• Used on wards

Question 11

How is AP CXR inferior to PA?

Answer 11

1) Heart shadow is magnified in AP, heart size can’t be assessed accurately
2) Scapulae overlie and partly obscure the lungs
3) Difficult for patient to take adequate inspiration when lying down

Question 12

Before you start analyzing CXR?

Answer 12

Check patient’s name and CHI
Check to see if there are side markers
Check the ‘ions’- Inspiration, Rotation, Penetration

Question 13

If a CXR is adequately inspired…?

Answer 13

The anterior ends of at least 6 ribs should be visible

Question 14

If a CXR is correctly centred?

Answer 14

The medial ends pf the clavicles should be equidistant from the spinous processes of the upper thoracic vertebrae

Question 15

Mediastinal Borders?

Answer 15

Aorta 
Pulmonary Artery 
Left auricle 
Left ventricle 
Right atrium 
Trachea 
Hemidiaphragm 
Stomach bubble 
Horizontal fissure

Question 16

How many lobes and fussures does right lung have?

Answer 16

3 lobes

2 fissures

Question 17

How many lobes and fissures does left lung have?

Answer 17

2 lobes 
1 fissure (oblique)