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At Johns Hopkins,

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we perform submillimeter axial CT

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scan images through the orbits.

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These raw data are collected and maintained

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for the radiologist to review.

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However, the technologists will reconstruct those axial

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scans into 3 mm axial, coronal,

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and sagittal scans of the orbits.

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These are performed and reconstructed in soft

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tissue and bone kernel and windows,

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so that way we have optimal visualization of

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both soft tissues and bones of the orbits.

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So you can, in addition, because you have the raw data,

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make multiformat reconstructions

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in the oblique projection, as you wish.

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Most of the imaging is done without contrast,

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particularly for the indications of trauma and sinusitis,

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as I mentioned previously. However,

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for those cases where we have vascular pathology,

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infectious or inflammatory lesions of the orbit,

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some of the idiopathic inflammatory conditions and

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granulomatous conditions, and for neoplasms,

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contrast will be given.

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And in addition to the non-contrast images,

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we will have post-contrast scans with the same protocol

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of thin-section imaging reconstructed in coronal,

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sagittal, and axial scans.

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For vascular lesions,

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we may also employ CTA or CT venography for better

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definition of the arterial and venous

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component of the vascular lesion.

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The scanning of the orbit is demonstrated

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here on this CT scan.

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As you can see,

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these scans are done with very thin-section technique.

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It's labeled as 0.5 mm as part of the raw data.

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This is then reconstructed into 3 mm thick

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slices for both soft tissue windows

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as well as for the bone windows.

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The bone window imaging is also performed with the

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bone kernel for the scanning.

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And as you can see,

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you have very high-resolution imaging that you

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can construct in any particular fashion.

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This is a coronal reconstruction in bone algorithm with

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3 mm thick sections.

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And in addition,

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we can also reconstruct it in sagittal plane,

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in this case, the soft tissue window.

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Were you to make your own multiplanar

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reconstructions using the raw data,

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you can have as thin sections as 0.5 mm

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imaging in any plane that you wish.