10Mhz A-scan Ultrasound Biometry Probe for Ophthalmology
Product Description
10Mhz A-scan Ultrasound Biometry Probe for Ophthalmology
Specification:
Name | 10MHz medical phthalmology probe | |||
Number | LPH-10MHz | Product Standard | Enterprise Standard | |
Structural Material | Performance Index (Water) | |||
Piezoelectric Ceramics | Size | Ф4.8×0.2 mm | Resonant Frequency | 10MHz±10% |
Material | PZT-5 | Relative Bandwidth | ＞65% | |
Capacitance | 400pf ±10% | Pulse Width | < 300ns | |
Transceiver Sensitivity | ＞ -35dB
| |||
Cable | Ф3mm twin-core shield cable
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Shell | Size | Ф9×75 mm | ||
Material | ABS | |||
Contacting Material on the front-end and eyeball | 5010A/5010B epoxy resin encapsulating material | |||
Technical Parameters | 5M | 7.5M | 10M | 13M |
Operating frequency | 5MHz | 7.5MHz | 10MHz | 13MHz |
Relative bandwidth | >50％ | >50％ | >60％ | >60％ |
relative sensitivity | >-24dB | >-30dB | >-35dB | >-42dB |
Echo pulse width | <0.7μs | <0.55μs | <0.4μs | <0.35μs |
Application | For pets, livestock measuring fat | For pets, livestock measuring fat | For measuring distance in ophthalmology | For measuring thickness in ophthalmology |
Working Principle:
A-scan ultrasound biometry, commonly referred to as an A-scan (short for Amplitude scan), is routine type of diagnostic test used in optometry or ophthalmology. The A-scan provides data on the length of the eye, which is a major determinant in common sight disorders. The most common use of the A-scan is to determine eye length for calculation of intraocular lens power. Briefly, the total refractive power of the emmetropic eye is approximately 60. Of this power, the cornea provides roughly 40 diopters, and the crystalline lens 20 diopters. When a cataract is removed, the lens is replaced by an artificial lens implant. By measuring both the length of the eye (A-scan) and the power of the cornea (keratometry), a simple formula can be used to calculate the power of the intraocular lens needed. There are several different formulas that can be used depending on the actual characteristics of the eye. All the information here is not valid for medical purposes.
The other major use of the A-scan is to determine the size and ultrasound characteristics of masses in the eye, in order to determine the type of mass. This is often termed quantitative A-scan. Instruments used in this type of test require direct contact with the cornea, however a non-contact instrument has been reported. Disposable covers, which come in actual contact with the eye, have also been evaluated.
Application Image: