Use the figure below to answer the following questions. 
Figure 2.2.1
-In Figure 2.2.1,the curve labelled A is the ________ curve and the curve labelled B is the ________ curve.
Definitions:
Roentgen
A unit of measurement for exposure to ionizing radiation, reflecting the amount of radiation required to create one electrostatic unit of charge in one cubic centimeter of dry air.
Contrast Medium
A substance used in medical imaging to enhance the visibility of internal structures in radiographic studies.
Images
Visual representations produced by techniques such as photography or illustration, used in various fields including medicine, science, and art.
Cassette
A cassette is a small, flat, rectangular plastic enclosure containing magnetic tape for playing or recording sound or data.
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