Endovascular-Image-Guided-Interventional (EIGI) treatment of neuro-vascular conditions such as aneurysms,
stenosed arteries, and vessel thrombosis make use of treatment devices such as stents, coils, and balloons which
have very small feature sizes, 10's of microns to a few 100's of microns, and hence demand a high resolution
imaging system. The current state-of-the-art flat panel detector (FPD) has about a 200-um pixel size with the
Nyquist of 2.5 lp/mm. For higher-resolution imaging a charge-coupled device (CCD) based Micro-Angio -
Fluoroscope (MAF-CCD) with a pixel size of 35um (Nyquist of 11 lp/mm) was developed and previously reported.
Although the detector addresses the high resolution needs, the Field-Of-View (FOV) is limited to 3.5 cm x 3.5 cm,
which is much smaller than current FPDs. During the use of the MAF-CCD for delicate parts of the intervention, it
may be desirable to have real-time monitoring outside the MAF FOV with a low dose, and lower, but acceptable,
To address this need, a novel imaging technique for biplane imaging systems has been developed, using an MAFCCD
in the frontal plane and a dose-reduced standard large FOV imager in the lateral plane. The dose reduction is
achieved by using a combination of ROI fluoroscopy and spatially different temporal filtering, a technique that has
been previously presented.
In order to evaluate this technique, a simulation using images acquired during an actual EIGI treatment on a patient,
followed by an actual implementation on phantoms is presented.