SPECT Views for Cardiac Amyloidosis Imaging

TO THE EDITOR: As I was reading articles on cardiac amyloidosis in the June 2023 issue of Journal of Nuclear Medicine Technology in preparation for a lecture to my students, I came across a contradiction that I would like to get sorted out. According to the continuing education article (1), ^99mTc-pyrophosphate SPECT images are to be displayed in cardiac views (short axis, vertical long axis, and horizontal long axis). In the practical protocol tip (2), however, the images are to be displayed in transverse, sagittal, and coronal sections. I can see the wisdom of both tomographic orientations. Since cardiac amyloidosis is a problem that affects the entire myocardium, heart-oriented views should be easy to create. On the other hand, we do not usually need to see bone uptake in other types of cardiac studies, such as myocardial perfusion imaging. Standard body planes will make the comparison of ^99mTc-pyrophosphate uptake in the heart to that in bone easier to perceive. I would like to have the authors reconcile these 2 display suggestions.

• Received for publication July 15, 2024.
• Accepted for publication July 17, 2024.