Proton density weighted spin-echo images
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Proton-density weighted images are related to the number of nuclei in the area being imaged (number of hydrogen protons), as opposed to the magnetic characteristics of the hydrogen nuclei. They are produced from the first echo. PD weighted images result when the contribution of both T1 and T2 contrast is minimised. They have a long TR (2000+ms) to minimise T1 differences because all tissues exhibit full longitudinal relaxation prior tobefore the next 90 degrees RF pulse. They have a short TE (TE1, 20ms) to minimise T2 differences. High PD tissues appear bright.
-<p><strong>Proton-density weighted images</strong> are related to the number of nuclei in the area being imaged (number of hydrogen protons), as opposed to the magnetic characteristics of the hydrogen nuclei. They are produced from the first echo. PD weighted images result when the contribution of both T1 and T2 contrast is minimised. They have a long TR (2000+ms) to minimise T1 differences because all tissues exhibit full longitudinal relaxation prior to the next 90 degrees RF pulse. They have a short TE (TE1, 20ms) to minimise T2 differences. High PD tissues appear bright.</p>- +<p><strong>Proton-density weighted images</strong> are related to the number of nuclei in the area being imaged (number of hydrogen protons), as opposed to the magnetic characteristics of the hydrogen nuclei. They are produced from the first echo. PD weighted images result when the contribution of both T1 and T2 contrast is minimised. They have a long TR (2000+ms) to minimise T1 differences because all tissues exhibit full longitudinal relaxation before the next 90 degrees RF pulse. They have a short TE (TE1, 20ms) to minimise T2 differences. High PD tissues appear bright.</p>
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