This unit is an excellent condition pre-owned Zeiss Cirrus HD-OCT 400. This Cirrus 400 OCT comes complete with power table.
The world’s best selling spectral domain OCT system is now offered in two models – the premium performance Model 4000 and the new Model 400.
What’s unique about Model 400?
Focused on the essential core OCT functionality, Model 400 is designed with the smaller budget in mind. Live OCT FundusTM technology1 provides the fundus image using the OCT scanner only, rather than an additional line scanning ophthalmoscope (LSO).
The Cirrus 4000 Model Versus the Cirrus 400
Both the Cirrus 400 and 4000 use spectral-domain OCT imaging technology at a scan rate of 27,000 A-scans/second, an A-scan depth of 2.0 mm (in tissue) an axial resolution of 5 μm (in tissue) and a transverse resolution of 15 μm (in tissue). The chief differences between the two models concern fundus imaging (live OCT vs. line-scanning OCT, described here) and field of view (36x22 degrees for the model 400 and 36x30 degree for the 4000).
The Cirrus HD-OCT Model 4000 provides a live fundus image using a line scanning ophthalmoscope to guide the placement of OCT scans. In 2009, Carl Zeiss Meditec engineers developed a novel method to generate the fundus image without the use of this additional hardware.
Here's how it works. The Cirrus HD-OCT uses LSO scan data to present a live fundus image. An operator can move the OCT cube within the fundus image before acquisition. After the OCT cube scan is acquired, an en-face OCT cube scan image is reconstructed and overlaid on the LSO live fundus image to indicate the position of OCT cube scan.
In the Cirrus HD-OCT Model 400, a novel approach is used to quickly capture the OCT cube scan and generate the en-face OCT fundus image continuously. The standard view of the Live OCT fundus image refreshes approximately once per second. Once the operator clicks the “Capture” button, acquisition of the Live OCT fundus image is completed and then the high-definition cube scan is acquired. The result is a background fundus image and full cube scan superimposed on the fundus image. Similarly, for the five-line raster pattern, the raster lines are superimposed on the OCT fundus image.
The high-definition cube and the five-line raster data that are collected are identical on both the Model 4000 and Model 400. As a result, the data are interchangeable and the same analysis can be performed on both models.
The one exception is a new Enhanced HD raster scan, which provides an even higher quality image than previously available. This feature is only available on the Model 4000. Future features dependent on the LSO fundus will be available only for the Model 4000.
“We were ready to get a new OCT instrument, so of course we looked at spectral domain,” says Scott Massios, MD, in private practice in Seneca, SC. “We tested both the Cirrus HD-OCT 400 and 4000 models and were impressed with the capabilities and acquisition times of both. Clinically, I found that the Model 400 provided the features that we need in my practice. The 400 is easy to use, just like the Model 4000, and the data-acquisition technology is identical to the Model 4000 but at a lower price.” OM
More Info / Pricing
Cirrus Model 400