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Match 1, 2, 3, 4 with A, B, C, D correctly.
Fill in Letters Medical Imaging
Technical Description
A: No CT reconstruction is used.
2: Planar scintigraphy B: No collimator is used.
1: X-гаy СТ
3: SPECT
C: An external photon source is used.
4: PET
D: It is an emission CT but cannot work
with positron emitters.

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