Intro To Radiology

Question 1

Who discovered X-ray

Answer 1

Wilhelm Conrad Roentgen

Question 2

When was the X-ray discovered

Answer 2

November 8, 1895

Question 3

The absorption of X-rays decrease as a result of

Answer 3

Density and Atomic Number

Question 4

On plain X-ray air/gas appears as?

Answer 4

BLACK

Question 5

On plain X-ray fat appears as?

Answer 5

DARK GREY

Question 6

On plain X-ray soft tissues and water appear as?

Answer 6

LIGHT GREY

Question 7

On plain X-ray bone appears as?

Answer 7

OFF WHITE

Question 8

On plain X-ray contrast material and metal appear as?

Answer 8

BRIGHT WHITE

Question 9

Factors that affect X-ray are

Answer 9

1) Movement
2) Magnification
3) Obesity
4) Scatter

Question 10

The thickness of a CT axial slide is?

Answer 10

2-10mm

Question 11

The density of bone or metal on CT is?

Answer 11

+1000 Hounsfield Unit

Question 12

The density of air on CT is?

Answer 12

-1000 Hounsfield Unit

Question 13

The density of water on CT is?

Answer 13

0 Hounsfield Unit

Question 14

Three windows in CT are:

Answer 14

1) Bone window
2) Soft tissue window
3) Blood window

Question 15

Examples of contrast given during an abdominal CT scan are?

Answer 15

1) Dilute barium

2) Gastrografin

Question 16

Dividing cells are particularly susceptible to ionizing radiation. These cells are

Answer 16

1) Gonads

2) Bone Marrow

Question 17

The two types of effects are:

Answer 17

1) Stochastic effect

2) Deterministic effect

Question 18

The three components of Basic Safety Standards are:

Answer 18

1) Justifiable exposure
2) As Low As Reasonable Allowable
3) Dose Limits

Question 19

The 2 reasons for dose limits are:

Answer 19

1) To keep dose below threshold value to reduce the deterministic effects
2) To decrease the risk of stochastic effect

Question 20

Main indications for ultrasound are:

Answer 20

1) Pregnancy
2) Uterine and ovarian lesions
3) Diseases of the liver spleen and pancreas
4) Abdominal masses
5) To confirm pleural effusion and pleural masses

Question 21

Advantages of Ultrasound includes:

Answer 21

1) Low cost of equipment
2) Allows scanning in any plane
3) Very portable
4) Safe
5) Readily available
6) Aids biopsy and drainage procedures

Question 22

Disadvantages of ultrasound are:

Answer 22

1) Cannot penetrate bone or gas
2) Very operator dependent
3) Obesity degrades images due to scatter phenomenon

Question 23

The main difference between T1 and T2 are?

Answer 23

T1 gives excellent anatomical definitions but are less sensitive to pathologies as compared to T2 which is highly sensitive to pathologies