Define septal penetration
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Collimators for Nuclear Medicine
For Parallel hole collimators it is important to keep the septal penetration below 2 %. Higher septal penetration will increase background noise, which can cause.
Description:Single photon emission computed tomography SPECT with keV photons is a challenging modality and collimators for this purpose require trade-offs among resolution, sensitivity and septal penetration. While PET is the modality of choice for imaging at keV, there are some procedures, e. NaI gamma camera projection images of 18 F keV and 99m Tc keV point sources were measured and the corresponding modulation transfer functions calculated. The projection images were reconstructed via filtered back-projection to obtain the tomographic three-dimensional 3-D point spread function. Differences between the and keV results were attributed mainly to septal penetration. Contrast measurements were made separately using 18 F and 99m Tc of a 20 cm phantom containing hot spheres and a warm background.