Scan Field of View vs Display Field of View (CT SFOV vs DFOV)

This is a video about SFOV (Scanner Field of View), Reconstructed Field of View and the more common Display Field of View (DFOV) for CT scanning (computed tomography). These are used slightly differently by the different CT vendors GEHC, Siemens, Phillips and Canon CT (formerly Toshiba CT).

[@bluewave7120]

Your choice of words makes it very easy to understand this explanation TY

[@HowRadiologyWorks]

You’re welcome, thanks for the feedback. Let me know of topics in the area that you want to see

[@abdovitamins6331]

Loved your practical demonstration a lot. Nice vedio.

[@HowRadiologyWorks]

Glad it was helpful! Thanks for dropping the comment

[@Caneyhead123]

How does SFOV effect resolution? For instance if you are looking at a small structure and will ultimately use a small DFOV, can a large SFOV be used without losing information? Example reconstructing a spine CT from an abdominal CT. Is this analogous to digital zoom vs optical zoom in camera world?

[@HowRadiologyWorks]

SFOV determines the physical bowtie filter and in some cases the maximum DFOV, but as you mentioned DFOV along with matrix size determines the sampling. So SFOV itself does not have impact on the resolution. This is a bit different than digital vs optical zoom

[@rasce_2609]

So the SFOV are the same in DFOV? Because the FOV you are scanning is what you will see in the display? Am I confused?

[@HowRadiologyWorks]

SFOV is determined at scan time and DFOV is smaller or equal to SFOV and can be changed after the fact in retrospective reconstructions

[@user-uu1zf6lo8f]

I am a Korean student who is learning about Ct. Which has more influence on pixel size between Scan FOV and Display FOV? And is pixel size closely related to SFOV?

[@HowRadiologyWorks]

Scan field of view is determined by the bowtie filter and the reconstruction field of view is often called the display field of view, the pixel size is DFOV/ matrix dimension, ie 250/512mm is a common pixel size for the brain