A Device Consisting of Very Thin Lead Strips with Radiolucent

question 39

Multiple Choice

A device consisting of very thin lead strips with radiolucent interspaces intended to absorb scatter radiation emitted from the patient is a:

• A) collimator.
• B) aperture diaphragm.
• C) cone.
• D) grid.

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Definitions:

Chi-square Test

A statistical test used to determine if there is a significant difference between observed and expected frequencies in one or more categories.

Null Hypothesis

A default hypothesis that there is no effect or no difference, and it is assumed true until evidence indicates otherwise.

Significant Change

A statistical term used to describe a change in data that is likely not due to random chance alone.

Expected Cell Count

In contingency table analysis, the theoretical number of observations that are expected in each cell of the table under the assumption of independence.