Graininess of a radiographic image results from:
a. large silver halide crystals.
b. the addition of radiosensitive dyes.
c. a decrease in film speed.
d. film packets that contain two films.
a. The larger crystals used in high-speed (fast) film result in a certain amount of graininess that reduces the sharpness of the radiographic image. It has been determined that this slight loss of image sharpness does not interfere with diagnosis and is tolerated because of the reduction in patient radiation exposure.
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Which of the following best describes motion at the sternoclavicular (SC) joint?
a. During clavicular elevation and depression, the disc of the SC joint moves with the medial end of the clavicle on the manubrial facet. b. During clavicular protraction and retraction, the disc of the SC joint moves with the medial end of the clavicle on the manubrial facet. c. During clavicular elevation and depression, the lateral end and medial end of the clavicle move in the same direction. d. During clavicular protraction and retraction, the lateral end and medial end of the clavicle move in opposite directions.
A son has called 911 for his father, who is having difficulty breathing. On scene, the 81-year-old patient is lying on a couch in the living room, lethargic, and in obvious respiratory distress. He is confused, but has an open airway. His respirations are 38 breaths/min and shallow, and his skin is extremely diaphoretic with cyanosis in the fingertips. At this time, the EMT should:
A) Suction the airway of secretions B) Start positive pressure ventilation C) Assess the patient's breath sounds D) Determine the patient's past medical history