Any misregistration will result in loss of detail in fine vessels. Expose the above registered combination. 4X to 7X seconds Expose 4501 in contact with the Angiogram for best sharpness and detail in vascular structures. Glossary Angiogram - A radiograph from the serial examination which shows the vascular structures resulting from injected contrast media. Expose - Activation of the light source in the contact printer for a predetermined time to yield a desired density in a Mask or Print.
Exposure is followed by chemical processing.
Mask - A reverse tone image exposed from an Initial Radiograph or an Angiogram. In general, Masks are exposed on 4509 Film. The processed image resulting from exposing a registered combination of one or more Masks, and an Initial Radiograph or Angiogram. In general, Prints are exposed on 4501 Film. Poor registration will result in prominent black or white boundary-edge images which will interfere with visualization of the vascular structures in the final subtraction print.