Module 48

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Module 48:

OVERVIEW

Estimated study time:  One and 1/2 hours.

Target Audience:  Assistant, technician, and technologist level personnel who are unfamiliar with Spectral Domain Optical Coherence Tomography.

Pre-requisites:  An understanding of ocular anatomy is helpful.  Familiarity with the Zeiss OCT 3 is helpful.

Date of original release:  March 2008

Financial Interest Statement:  Neither author has any financial interest in any instrument mentioned in this course, with the following exceptions: Gary Gallimore has received modest consulting fees and travel assistance from Opko regarding the Opko Spectral Domain OCT.

Section 1:

Description of content:  This section describes the limitations of time domain OCT technology.

Instructional  objectives:  Upon completion of  this section,  the student should be able to:

• Describe the differences between OCT imaging and ultrasound imaging.

• Define sources of error inherent in OCT scanning, including motion artifacts, layer recognition, interpolation, and registration.

Section 2:

The Advances of Spectral Domain Technology

Description of content:  This section describes how spectral domain technology has improved OCT scanning as compared to time domain technology.  Microperimetry is also discussed.  The Opko SLO / Spectral Domain OCT is discussed as an example of spectral domain OCT instrumentation.

Instructional objectives:  Upon completion of this section,  the student should be able to:

• Describle the basic design of the spectral domain OCT

• Define terminology associated with spectral domain OCT scanning

• Discuss how spectral domain OCT scanning has reduced sources of error associated with time domain OCT scanning

• List characteristics of microperimetry testing

Section 3:

Scanning Techniques

Description of content:  This section discusses changes in software protocol that are associated with spectral domain scanning.  Patient management techniques aimed at improving scan quality are also discussed.  The Opko SLO / Spectral Domain OCT is discussed as an example of spectral domain OCT instrumentation.

Instructional objectives:  Upon  completion of this section,  the student should be able to:

• Describe characteristics of scan quality, including the concepts of image resolution and scan speed

• Discuss how a topographical map is made and identify a morphological characteristic that will not show up on the map

• Identify characteristics of good scanning techniques

About the Authors: 

Felix N. Sabates, MD, is former Chairman of the Department of Ophthalmology at the University of Missouri-Kansas City School of Medicine.  He has been a practicing ophthalmologist for many years. 

Gary Gallimore is a certified ophthalmic technologist who assists with research at the Eye Foundation of Kansas City and works for a large multi-specialty ophthalmology practice in the metro area of Kansas City.   He has taught CE courses for many years on all subjects of ophthalmic technology.  He served as co-author for this module.

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