Define septal penetration
For Parallel hole collimators it is important to keep the septal penetration below 2 %. Higher septal penetration will increase background noise, which can cause.
Convolution-Based Forced Detection Monte Carlo Simulation Incorporating Septal Penetration Modeling
Description:Anterior left and posterior right images of second I scan with medium-energy collimator show new lesion in right hemithorax; persistent metastatic disease at levels T6, L1, and L2; and small area of questionable residual functioning thyroid tissue in neck. The images were blurred and had low spatial resolution. Possible technical causes of the blurred images included a camera that was off the photon peak, patient motion, an improper distance between the camera and the patient, and interference from prior radiotracer administration. However, he had not been able to return for a diagnostic image after the administration because of a family emergency. The current scan was a repeated order by the referring clinician.
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