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. Author manuscript; available in PMC: 2023 Apr 27.
Published in final edited form as: J Nucl Cardiol. 2022 Jun 14;30(2):604–615. doi: 10.1007/s12350-022-03010-8

Figure 3: Overview of nonlinear diffeomorphic registration pipeline.

Figure 3:

The GAN generated pseudo-CT from NAC PET was registered to the corresponding non-contrast CT attenuation correction image using diffeomorphic (demons) non-rigid registration (Transform 1). The non-contrast CT AC was then registered rigidly to CT angiography image of the same patient (Transform 2). These two transforms (Transforms 1 and 2) were applied to AC PET image, registering PET to CT angiography automatically.

AC: attenuation corrected, CT: computed tomography, NAC: non-attenuation corrected, PET: positron emission tomography