Grid

Which grid error would produce this image?

• An angled x-ray beam

• An upside down focused grid

• A grid that is placed on a soft bed

• An x-ray beam that is not centered to the middle of the grid.

Answer explanation

Using a grid upside down would only matter with a FOCUSED grid. The outer grid strips are angled to match the diverging beam .

If the grid is upside down, those outside, angled grid strips are angled OPPOSITE to the angled x-rays.

• Increases

• Deacreases

• Is not affected

Answer explanation

More lead=

more scatter captured

Formula is primary

scatter

If the bottom number goes down (less scatter gets through)

then the selectivity goes up.

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-5

Which formula describes the ratio of the number of x-rays striking the grid compared to the number of x-rays exiting the grid?

• Grid ratio

• Grid frequency

• Bucky Factor

• Selectivity

If grid ratio increases, which of the following increases?

• k

• B

• h and or D

• All of these

Which of the following would produce an image with the most exposure?

• A

• B

• C

• D

Answer explanation

What are you looking for in each factor?

Most exposure=

↑ mAs

↑ kVp

↓ grid ratio

Least exposure=

↓ mAs

↓ kVp

↑ grid ratio

Tags

NGSS.MS-PS4-1

NGSS.MS-PS4-2

Which of the following is TRUE? *Choose ALL that are correct.

• Moving north or south 1 degree is equal to moving east or west 1 degree anywhere on Earth

• Latitude lines are equidistant all over the Earth (traveling north or south)

• Moving north or south is a distance of 111 miles (69 km)

• Latitude lines NEVER cross one another

• Longitude lines get closer to one another at the Earth's poles

The 0 degree mark of longitude is known as the ___________ ______________ measure from Greenwich England.

• Equator

• Prime Meridian

• International Date Line

• Tropic of Cancer

What is the NAME of the latitude located at 23.5 degrees SOUTH of the Equator?

• Equator

• Prime Meridian

• Tropic of Cancer

• Tropic of Capricorn

Which location is located at 66 degrees NORTH of the Equator?

• Tropic of Capricorn

• Tropic of Cancer

• Arctic Circle

• Antarctic Circle

Describe what is shown in the picture.

• The map shows lines of longitude.

• The map shows lines of latitude.