RVG Sensor – Working Principle and It’s Applications

X-rays were invented by W.H.Roentgen, 122 years ago. These have found various applications like in Manufacturing industries, in medical imaging, etc… X-rays also plays a vital role in dentistry. Dentist’s use radiographs for knowing the damages caused to the tissue under the gems. With the advance in technology, dental imaging techniques also improved considerably. Digital radiography was introduced in dentistry by the French dentist DR. Francis Moyen, in the year 1987. Seeing the effectiveness of this technology, various changes are made and new systems are being developed for its implementation. Digital radiography is also known as RadioVisioGraphy. RVG sensor is used in the process of Digital radiography.

What is an RVG Sensor?

RVG stands for RadioVisioGraphy. This technology is used as an alternative to X-ray radiography in dentistry. RVG Sensors are developed keeping their durability and image quality in mind.

The hermetically sealed sensor housing makes this sensor waterproof allowing for versatile applications. The shock protection layer protects the sensor from bites and drops. The combination of High-sensitivity Scintillator, Fiber Optics, and High-resolution rugged CMOS detector helps the sensor in achieving high-quality images.

Working Principle of RVG Sensor

The Sensor has two side- reactive and nonreactive. The reactive side should be used for taking images. The tissue is exposed to X-ray radiation and the refracted light is captured by the sensor. The image is processed instantly and converted into digital data using Analog-to-Digital converters. This digital data is sent to the computer where the doctor can view the scan instantly. Cable attachment is located at the inactive side of the sensor.


When the non-reactive side s exposed to X-ray no image appears on the screen. To transfer the image to the computer, the sensor has a USB. This USB should be connected to the back of the PC.

The X-ray generator used should operate between 60kV to 70kV. This sensor is not compatible with generators that operate at a voltage less than 60kV. If the images appear too dark decrease the exposer time or if images appear grainy increase the exposure time. The type of X-ray generator used also affects the image quality.



This sensor reduces X-ray exposure time when used for dental imaging. Compared to X-ray radiology methods, the RVG sensor reduces the patient’s exposer to X-ray radiations by  80 percentage.

Use of this sensor helps the doctor to get instant results and decrease the waiting time of the patients. This sensor also provides the flexibility of saving the images and changing their size or contrast for better viewing.


This sensor is highly used in Dentistry for digital imaging. This sensor is also known as Intraoral sensor. For different types of applications, RVG are available in three sizes – size 0, size 1, size 2.

Size 0 sensor is designed for pediatric examinations. The size 1 is the general-purpose sensor and is very useful for vertical images. For the acquisition of bitewing images and periapical, size 2 sensor is used.

The use of RVG technology has increased the efficiency of dental radiography. Which size RVG sensor is very useful for vertical images?