T1 mapping

T1 mapping

Suraj S. Suraj S.

Suraj S.

Research Associate Professor, University of Pennsylvania MRI Physicist, The Children’s Hospital of Philadelphia

发布日期: 2023年2月8日
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T1-relaxation time is a fundamental parameter in MRI relating to the interaction and energy exchange between the hydrogen atoms (also known as protons) and their surrounding environment.

In the presence of an external magnetic field (in the bore of MRI scanner), by applying an external Radio Frequency (RF) pulse to the protons that are aligned in the longitudinal plane, the magnetization can be perturbed away from equilibrium towards the transverse plane.

After the RF pulse is turned off, the protons will give its energy to the surrounding environment and go back to equilibrium, and they will realign with the magnetic field. The rate at which longitudinal magnetization recovers is called T1. So T1 is defined by the time for the longitudinal magnetization to grow to about 63% of its final value (see figure). T1 mapping is a method of quantifying the T1 value of the tissue across the region of interest. T1 mapping also refers to pixelwise illustrations of T1 relaxation times on a map. Refer to my paper below for more details.

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