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An image of the chest of a patient is taken with an X-ray machine on a photographic film. The Hurter-Driffield (HD) curve of the film is shown in the figure. The highly absorbing parts of the body (e.g. bones), show up as low exposure regions(mapped near A) and the less absorbing parts (e.g. muscles) show up as high exposure regions(mapped near B).
If the exposure time is increased 10 times, while keeping the voltages and currents in the Xray machine constant, in the image,
  • a)
    Contrast decreases since B moves into the shoulder region
  • b)
    contrast decreases since both A and B move into the shoulder region
  • c)
    Contrast increases since A moves into the toe region
  • d)
    Contrast decreases since both A and B move into the toe region
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
An image of the chest of a patient is taken with an X-ray machine on a...
If the exposure is increased beyond the toe of the curve, the density begins to increase in direct proportion to log E. If the exposure is increase further, the density saturates after an intermediate region called the “shoulder”. In the saturated region, there is no further increase in the density of the developed grains as the exposure increases.
Optical density, D = −log10E
Where E is the exposure given by integral of the intensity per unit area over the exposure time Δt intensity per unit area over the exposure time Δt
If exposure time is increased 10 times then optical density will be also increased.
For human eye, increase in optical density means decrease in brightness.
Hence, contrast decreases since B moves into the shoulder region.
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An image of the chest of a patient is taken with an X-ray machine on a photographic film. TheHurter-Driffield (HD) curve of the film is shown in the figure. The highly absorbing parts ofthe body (e.g. bones), show up as low exposure regions(mapped near A) and the lessabsorbing parts (e.g. muscles) show up as high exposure regions(mapped near B).If the exposure time is increased 10 times, while keeping the voltages and currents in the Xraymachine constant, in the image,a)Contrast decreases since B moves into the shoulder regionb)contrast decreases since both A and B move into the shoulder regionc)Contrast increases since A moves into the toe regiond)Contrast decreases since both A and B move into the toe regionCorrect answer is option 'A'. Can you explain this answer?
Question Description
An image of the chest of a patient is taken with an X-ray machine on a photographic film. TheHurter-Driffield (HD) curve of the film is shown in the figure. The highly absorbing parts ofthe body (e.g. bones), show up as low exposure regions(mapped near A) and the lessabsorbing parts (e.g. muscles) show up as high exposure regions(mapped near B).If the exposure time is increased 10 times, while keeping the voltages and currents in the Xraymachine constant, in the image,a)Contrast decreases since B moves into the shoulder regionb)contrast decreases since both A and B move into the shoulder regionc)Contrast increases since A moves into the toe regiond)Contrast decreases since both A and B move into the toe regionCorrect answer is option 'A'. Can you explain this answer? for GATE 2024 is part of GATE preparation. The Question and answers have been prepared according to the GATE exam syllabus. Information about An image of the chest of a patient is taken with an X-ray machine on a photographic film. TheHurter-Driffield (HD) curve of the film is shown in the figure. The highly absorbing parts ofthe body (e.g. bones), show up as low exposure regions(mapped near A) and the lessabsorbing parts (e.g. muscles) show up as high exposure regions(mapped near B).If the exposure time is increased 10 times, while keeping the voltages and currents in the Xraymachine constant, in the image,a)Contrast decreases since B moves into the shoulder regionb)contrast decreases since both A and B move into the shoulder regionc)Contrast increases since A moves into the toe regiond)Contrast decreases since both A and B move into the toe regionCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for GATE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for An image of the chest of a patient is taken with an X-ray machine on a photographic film. TheHurter-Driffield (HD) curve of the film is shown in the figure. The highly absorbing parts ofthe body (e.g. bones), show up as low exposure regions(mapped near A) and the lessabsorbing parts (e.g. muscles) show up as high exposure regions(mapped near B).If the exposure time is increased 10 times, while keeping the voltages and currents in the Xraymachine constant, in the image,a)Contrast decreases since B moves into the shoulder regionb)contrast decreases since both A and B move into the shoulder regionc)Contrast increases since A moves into the toe regiond)Contrast decreases since both A and B move into the toe regionCorrect answer is option 'A'. Can you explain this answer?.
Solutions for An image of the chest of a patient is taken with an X-ray machine on a photographic film. TheHurter-Driffield (HD) curve of the film is shown in the figure. The highly absorbing parts ofthe body (e.g. bones), show up as low exposure regions(mapped near A) and the lessabsorbing parts (e.g. muscles) show up as high exposure regions(mapped near B).If the exposure time is increased 10 times, while keeping the voltages and currents in the Xraymachine constant, in the image,a)Contrast decreases since B moves into the shoulder regionb)contrast decreases since both A and B move into the shoulder regionc)Contrast increases since A moves into the toe regiond)Contrast decreases since both A and B move into the toe regionCorrect answer is option 'A'. Can you explain this answer? in English & in Hindi are available as part of our courses for GATE. Download more important topics, notes, lectures and mock test series for GATE Exam by signing up for free.
Here you can find the meaning of An image of the chest of a patient is taken with an X-ray machine on a photographic film. TheHurter-Driffield (HD) curve of the film is shown in the figure. The highly absorbing parts ofthe body (e.g. bones), show up as low exposure regions(mapped near A) and the lessabsorbing parts (e.g. muscles) show up as high exposure regions(mapped near B).If the exposure time is increased 10 times, while keeping the voltages and currents in the Xraymachine constant, in the image,a)Contrast decreases since B moves into the shoulder regionb)contrast decreases since both A and B move into the shoulder regionc)Contrast increases since A moves into the toe regiond)Contrast decreases since both A and B move into the toe regionCorrect answer is option 'A'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of An image of the chest of a patient is taken with an X-ray machine on a photographic film. TheHurter-Driffield (HD) curve of the film is shown in the figure. The highly absorbing parts ofthe body (e.g. bones), show up as low exposure regions(mapped near A) and the lessabsorbing parts (e.g. muscles) show up as high exposure regions(mapped near B).If the exposure time is increased 10 times, while keeping the voltages and currents in the Xraymachine constant, in the image,a)Contrast decreases since B moves into the shoulder regionb)contrast decreases since both A and B move into the shoulder regionc)Contrast increases since A moves into the toe regiond)Contrast decreases since both A and B move into the toe regionCorrect answer is option 'A'. Can you explain this answer?, a detailed solution for An image of the chest of a patient is taken with an X-ray machine on a photographic film. TheHurter-Driffield (HD) curve of the film is shown in the figure. The highly absorbing parts ofthe body (e.g. bones), show up as low exposure regions(mapped near A) and the lessabsorbing parts (e.g. muscles) show up as high exposure regions(mapped near B).If the exposure time is increased 10 times, while keeping the voltages and currents in the Xraymachine constant, in the image,a)Contrast decreases since B moves into the shoulder regionb)contrast decreases since both A and B move into the shoulder regionc)Contrast increases since A moves into the toe regiond)Contrast decreases since both A and B move into the toe regionCorrect answer is option 'A'. Can you explain this answer? has been provided alongside types of An image of the chest of a patient is taken with an X-ray machine on a photographic film. TheHurter-Driffield (HD) curve of the film is shown in the figure. The highly absorbing parts ofthe body (e.g. bones), show up as low exposure regions(mapped near A) and the lessabsorbing parts (e.g. muscles) show up as high exposure regions(mapped near B).If the exposure time is increased 10 times, while keeping the voltages and currents in the Xraymachine constant, in the image,a)Contrast decreases since B moves into the shoulder regionb)contrast decreases since both A and B move into the shoulder regionc)Contrast increases since A moves into the toe regiond)Contrast decreases since both A and B move into the toe regionCorrect answer is option 'A'. Can you explain this answer? theory, EduRev gives you an ample number of questions to practice An image of the chest of a patient is taken with an X-ray machine on a photographic film. TheHurter-Driffield (HD) curve of the film is shown in the figure. The highly absorbing parts ofthe body (e.g. bones), show up as low exposure regions(mapped near A) and the lessabsorbing parts (e.g. muscles) show up as high exposure regions(mapped near B).If the exposure time is increased 10 times, while keeping the voltages and currents in the Xraymachine constant, in the image,a)Contrast decreases since B moves into the shoulder regionb)contrast decreases since both A and B move into the shoulder regionc)Contrast increases since A moves into the toe regiond)Contrast decreases since both A and B move into the toe regionCorrect answer is option 'A'. Can you explain this answer? tests, examples and also practice GATE tests.
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