Product Description

Artemis' Graphical Interface

Scanning capability

Sample Images

Applications of the technology

Precision, Resolution, and Accuracy

Scan technology slideshow (formatted for Internet Explorer)

Product Description:

Artemis 2 Artemis is a very high frequency (VHF) ultrasound eye scanner. In use, the patient leans forward placing their head onto an adjustable headrest. The headrest's unique design permits the patient to pull away quickly from the scanner if desired. An eyecup filled with a saline-based interface fluid couples the ultrasound signal to the eye, while a precision mechanism moves the transducer past the front of the eye. During the accurately controlled arc motion of the transducer, which lasts less than one second, many thousands of ultrasound samples are digitized. Following a scan, signal analysis is performed on a PC-compatible microcomputer, and the data are available for immediate viewing on an LCD monitor or archival storage to disc media. Artemis is very flexible; many adjustments to the scanning parameters are possible to customize the scan to your clinical needs. Functions are provided for centering the scan about the optical axis of the eye. The starting location of the scans as well as the extent can be varied as desired, to view image planes through the eye at different angles. [ more Technology information >> ]

Artemis' Graphical Interface:

Artemis has an advanced graphical interface which presents data in a multi-window format.  The main windows (seen below) show: the optical camera view of the eye being scanned; the current scanning parameters; an oscilloscope or A-mode representation of the current ultrasound beam; and a complete B-mode image of the current scan. More details - click here >>

Scanning capability:

Data from Artemis scans provide:

High-resolution B-scan images of:

• Full cornea, flap and residual stromal bed
• Anterior chamber structures, angle-to-angle
• Posterior chamber structures, sulcus-to-sulcus

High precision biometry is possible of:

• 3D flap thickness mapping
• 3D residual stromal bed thickness mapping
• 3D anterior segment angle-to-angle
• 3D posterior segment sulcus-to-sulcus measurement
• 3D corneal thickness mapping

Sample Images:

Pachymetric Topography of LASIK

Details of C12 >>

 

	Anterior Segment
	Details of Horizontal B-Scans >> Click for larger image >>
	Click for larger image >>
	Anterior Segment - Lights On  Click for larger image >>	Anterior Segment - Lights Off Click for larger image >>
	Scleral Thickness High resolution arc B-scan of temporal quadrant of left eye in normal subject. Note the clearly distinguished scleral borders to enable biometryin planning scleral perforating surgery (e.g. presbyopic procedures, deep sclerectomy etc.). Visualization and biometry of anterior segment pathology (tumors, cysts, foreign bodies, ciliary detachment, etc.) is made simple. Click for larger image >>

Precision, Resolution, and Accuracy

Precision is the measure of the smallest increment of distance that can be measured repeatably. Precision of Artemis measurements is on the order of 1µm to 5 µm.

Resolution is the minimum distance between two features at which the features are distinguishable as separate objects rather than one. Resolution of Artemis images ranges from 35 µm to 65 µm, depending on what orientation in the image it is measured.
 

Accuracy is the measure of how much a measurement varies from the true distance. For Artemis, the primary limitation on accuracy is knowing the true speed-of-sound in the tissue being measured and is estimated at less than ±1.8%.
 

Further information on resolution, precision, and accuracy measurements can be found in:
Arc-scanning very high-frequency ultrasound for 3-D pachymetric mapping of the
corneal epithelium and stroma in laser in situ keratomileusis. J Refract Surg. 16:414-430, 2000.