scans

[Darrin Landry]

Can someone explain to me why some scans are distinctly diagonal? So much so that I am not able to capture the entire scan on the screen.

I've been given several different explanations, none of which make sense.

 

Thanks

 

Darrin

 

Darrin A. Landry, CRA, OCT-C

Ophthalmic Consultant

Bryson Taylor Inc.

www.brysontaylorpublishing.com

[Eric Kegley]

I find that high myopes will almost always produce a diagonal scan. I typically rotate the orientation of the lines to flatten it. I don't know if that helps. 

Eric Kegley, CRA, COA

Director of Ophthalmic Imaging

6560 Fannin St., Suite 750

Houston, TX 77030

Main 713 524-3434

Sent from my iPhone

--
--
You received this message because you are subscribed to the Google
Groups "Spectralis/HD OCT User Group" group.
To post to this group, send email to
spectralis...@googlegroups.com
To unsubscribe from this group, send email to
spectralis-user-...@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/spectralis-user-group?hl=en?hl=en

---
You received this message because you are subscribed to the Google Groups "Spectralis/HD OCT User Group" group.
To unsubscribe from this group and stop receiving emails from it, send an email to spectralis-user-...@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

[CPMC Ophthalmic Diagnostic Center]

Our High Myope protocol is a 15 degree vertical and horizontal scan

 

Depending on the slope of the staphyloma, generally speaking I find the vertical scan to be most useful

 

Denice Barsness, CRA, COMT, ROUB, CDOS, FOPS

Ophthalmic Diagnostic Center

CPMC Department of Ophthalmology

2100 Webster Street Suite 212

San Francisco CA 94115

(415) 600-3937   FAX (415) 600-6563

[Darrin Landry]

I find that I get a diagonal scan on a few myopes, but I also see it on emmetropes, patients with no astigmatism, etc. There doesn't seem to be a consistant group that this happens to.

 

 

Darrin A. Landry, CRA, OCT-C

Ophthalmic Consultant

Bryson Taylor Inc.

www.brysontaylorpublishing.com

---

From: "CPMC Ophthalmic Diagnostic Center" <cpmce...@sutterhealth.org>
Sent: Wednesday, March 12, 2014 11:14 AM
To: "spectralis...@googlegroups.com" <spectralis...@googlegroups.com>
Subject: [spectralis-user-group] Spectralis and High Myopes

[Eric Kegley]

Must be user error! :-)

 

Thanks,

EK

 

Eric Kegley, CRA, COA

Director of Ophthalmic Imaging

Retina Consultants of Houston

6560 Fannin St., Suite 750

Houston, TX 77030

 

Main    713 524-3434

Fax      713 524-3220

www.houstonretina.com

www.facebook.com/RetinaConsultantsofHouston

 

---

From: spectralis...@googlegroups.com [mailto:spectralis...@googlegroups.com] On Behalf Of Darrin Landry
Sent: Wednesday, March 12, 2014 10:16 AM
To: spectralis...@googlegroups.com; spectralis...@googlegroups.com
Subject: re: [spectralis-user-group] Spectralis and High Myopes

[CPMC Ophthalmic Diagnostic Center]

Might you consider the first refractive surface that the scanner must pass through, the radius of curvature of the cornea

[Stuart Alfred]

Yea, I often ask patients that are not clearly high myopes based on obvious things seeing thick glasses or fundus vessel pattern, if they have had corrective surgery on their corneas.  If time permits I'll dig into the chart or EMR.  I have set up a high myope pre set scan on the Spectralis with vertical scans.

Stuart Alfred, CRA, OCT-*C*
*
cell 317 517-9455
528 N. Bauman St.
Indianapolis, IN 46214-3618
*

[Darrin Landry]

Stu

thanks- as I mentioned, I'm seeing this on patients who are not myopic, have no corneal astigmatism, refractive error, or past refractive surgery. I see it in both phakic and pseudophakic patients, so I can't blame lenticular astigmatism.

besides user error (ha ha, Eric), does anyone else have any insight?

 

thanks

Darrin

 

Darrin A. Landry, CRA, OCT-C

Ophthalmic Consultant

Bryson Taylor Inc.

www.brysontaylorpublishing.com

---

From: "Stuart Alfred" <stuart...@gmail.com>
Sent: Wednesday, March 12, 2014 1:31 PM
To: "spectralis...@googlegroups.com" <spectralis...@googlegroups.com>
Subject: Re: [spectralis-user-group] Spectralis and High Myopes

[sandor ferenczy]

I think, in comparison to the stratus, the length of the default line scans is much longer, so we are seeing more of the actual shape of the anatomy.

add to this better choroidal imaging, and we are at a point where the 2 mm axial imaging depth doesn't always cover "enough" of the posterior portion in a 9 mm wide scan.

in real application, I almost always find myself making small adjustments to correct scan location in the midst of a multi-line scan. twists, turns and rotating the joystick is definitely a help.

in the same way, I have found that, in a normal eye, a multi line scan of the entire IR image (15 degrees?) with the fovea at the correct depth will have the far superior and inferior lines almost off the screen.

I believe we're seeing that same "anomaly" that makes the foveola in focus and the majority of the macula just a touch soft in fundus photographs.

-sandor

<image001.png>Eric Kegley, CRA, COA

<image001.png>