Radiographic TechniqueCâu 38 / 100
A developed film is very light overall and shows a faint pattern of tiny diamonds or a herringbone design. What happened?
a.The developer was too warm
b.The film was left in the fixer overnight
c.The patient moved during the exposure
d.The film packet was placed in the mouth backward, so the beam passed through the lead foil first
Giải thích
The herringbone or tire-track pattern is imprinted by the lead foil backing when the packet is reversed, and the foil also absorbs much of the beam, producing a light image. A warm developer produces a dark image rather than a light one. Prolonged fixing bleaches the image but leaves no herringbone pattern, and patient movement produces blurring.
Luyện miễn phí toàn bộ 100 câu hỏi — không cần đăng ký.
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