Radiology Lec 2

Question 2

Define
- Panorama
- Tomograph
- Panoramic radiograph

Answer 2

Panorama= unbroken/complete view of the whole region surrounding an observer

Tomography = a technique for displaying a representation of a cross section through a human body or other solid object using X-rays or ultrasound.

PAnoramic radiogrpah = two-dimensional (2-D)
dental x-ray examination that captures the entire mouth in a single image, including the teeth, upper and lower jaws, surrounding structures and tissues. The jaw is a curved structure similar to that of a horseshoe.

Question 3

collimated meaning

Answer 3

(of rays of light or particles) made accurately parallel.

Question 4

**

True/Flase. Structures closer to the beam casts sharper images.

Answer 4

false structures closer to the receptor casts sharper images

Question 5

T/F. Structures closer to the source casts magnified & blurred images.

Answer 5

True

Question 6

Compare the difference between object in, behind & anterior to focal trough

Question 7

define focal trough/img layer.

Answer 7

The three-dimensional, horseshoe-shaped zone where images are sharp is called the focal trough, or image layer.

Question 8

What is ghost IMG and how are they dispalyed (what are 3 main characteritics)?

Answer 8

Ghost IMG are displayed on the opposite side of where the object is.

• They are blurry
• HIgher up
• Opposite side.

check ghost img on slide 15&16

Question 9

Can ghost IMG be on anatomical structures,

Answer 9

Yes they can. E.g. angle of the banidible. slide 16

Question 10

How are double real Images formed?

Answer 10

They are formed when the beam passes structures in the midline (cervical spine & upwards) twice

Question 11

H

Where does an object have to sit for it to be a single real IMG

Answer 11

When the object lies within the focal trough and also lies between the centre of rotation and the film