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V. Morales-Canton, G. Salcedo-Villanueva, M. E. Shusterman, J. Dalma-Weiszhausz, D. Ochoa-Contreras, H. Quiroz-Mercado, R. Velez-Montoya; Standard A-Mode Ultrasonography vs. PalmScanTM Ultrasonography: Biometric Measurements. Invest. Ophthalmol. Vis. Sci. 2009;50(13):3705.
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Ultrasonography has become a critical ancillary test in the clinical practice of ophthalmology. It is commonly used as a standardized method for assessing intraocular biometry. The PalmScan A2000 ultrasonography system (Micro Medical Devices, Calabasas, CA) is a portable A-scan device that uses the same principles as standard A-scan, and supports immersion biometry technique for accurate determination of ocular parameters such as globe axial length. The aim of the study is to compare the reliability of the PalmScan’s performance as compared to standard A-scan, in order to use the two systems interchangeably.
We measured the axial length (AL), Anterior Chamber Deep (ACD) and the Lens Thickness (LT) in 32 patients using the PalmScan A2000 with an immersion probe and standard A-mode ultrasound (Eye CubedTM, Ellex, Adelaide, Australia). The results were compared by non-parametric statistics.
PalmScan (mean): AL: 23.2±1.07mm, ACD: 3.36± 0.6mm, LT: 4.19± 1.5mm. A-Mode (mean): AL: 23.16± 1.11mm, ACD: 2.8±0.67mm, LT: 4.33± 1.5mm. There was a statistically significant difference between ACD measurements (P<0.0005), but not between AL or LT determinations.
The PalmScan A2000 device is as reliable as standard A-mode ultrasonography to obtain AL, and LT measurements (p>0.1). It appears to differ in its ACD determination by approximately 0.5 mm, and this finding should be taken into account when attempting to use the systems interchangeably.
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