Differentiation of benign tumors using NMR T1 relaxation times

Determine whether benign tumors, such as fibroadenomas, can be differentiated from malignant tumors and normal tissues using spin-echo nuclear magnetic resonance measurements of the water-proton spin-lattice relaxation time (T1), as employed in early rat tissue experiments.

Background

In the 1971 Science report by Raymond Damadian, spin-echo NMR was used to measure the T1 relaxation times of water protons in several rat tissues, including malignant tumors and normal tissues. He found that malignant tumors exhibited distinct T1 values compared to normal tissues, while benign fibroadenomas showed T1 values similar to muscle.

The paper’s summary table notes that although NMR could differentiate malignant tumors from normal tissues based on T1, it remained unclear whether benign tumors could be distinguished, highlighting an unresolved question in the early development of NMR-based cancer detection.