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A-LevelPhysicsMedical physics9702/42 · Oct/Nov 2019 · Q75 Marks

Describe the principles of computed tomography (CT) scanning.

(a)Describe the principles of computed tomography (CT) scanning.[5]

Mark scheme

Marking points from the official mark scheme (Oct/Nov 2019). The mark or mark type is shown in brackets.

[B1] X-rays are used
[B1] section (of object) is scanned
[B1] scans/images taken at many angles/directions or images of each section are 2-dimensional
[B1] images of (many) sections are combined
[B1] (to give) 3-dimensional image of (whole) structure

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About this question

Topic: Medical physics, A-Level Physics (syllabus 9702). Structured question, 5 marks.
Source: A-Level Physics, Oct/Nov 2019 Paper 4 Variant 2, question 7.

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