Dentistry thrives on precision and accuracy, and the quality of radiographic images plays a crucial role in diagnosis and treatment planning. In this article, we will discuss the factors affecting radiographic image quality in your practice, the concept of Modulation Transfer Function (MTF), and how the DC-Air™ technology can enhance diagnostic capabilities.
Image Quality in Dentistry
Image quality, which encompasses accuracy, detail, and proper positioning, is vital in dentistry. Accurate and detailed images enable dentists to diagnose conditions more effectively, thus saving time and enhancing productivity. Additionally, it offers a better patient experience as it could result in faster and more precise treatments. Factors that affect the image quality achieved when using digital x-ray sensors include:
X-ray Sensor Specifications: The choice of sensor determines the level of detail that can be captured. Spatial resolution and contrast accuracy can vary between different brands and models of sensors as we will discuss more later.
Positioning: Proper positioning of the sensor in the mouth and the x-ray source is critical to avoid distortion or omission of relevant details. This includes proper alignment of the sensor in the mouth as well as the angle and distance of the x-ray source outside the mouth.
Exposure Settings: The settings of kV (kilovoltage), mA (milliamperage), and time are important to adjust for any sensor to capture the right details without overexposure that leads to “burn out” of information or underexposure which leads to a lighter, less detailed image. kV is the energy of the x-ray photons, mA is the current or amount of x-rays, and the exposure time dictates how long the x-ray signal will be emitted.
Digital Image Processing: Techniques for enhancing the image should be carefully chosen so as not to compromise the integrity of the image. For example, sharpening or edge enhancement features may make the radiograph appear more “crisp” but can also add unwanted noise and compromise the accuracy of fine details in the image.
Understanding MTF (Modulation Transfer Function)
MTF or Modulation Transfer Function is a measure of the ability of an imaging system to reproduce the contrast of an object at different spatial frequencies. It indicates how well the system can transfer contrast from the object to the image as a function of spatial frequency.
While spatial resolution (expressed in line pairs per millimeter or lp/mm) is often used to compare sensors, it does not account for contrast. MTF provides a more complete description of image quality as it considers both resolution and contrast. Essentially, MTF describes how accurately the radiograph represents the object(s) in the image.
The Prowess of DC-Air™
Direct Conversion Technology
DC-Air™ employs direct conversion technology, where the X-ray photons are directly converted into electrical charges. This eliminates the need for an intermediate conversion into light photons, thus reducing the blurring and noise, leading to a higher MTF.
Zero Profile® Positioning System
Accompanied by the Zero Profile™ holder system, the DC-Air™ ensures perfect positioning. This system is specifically designed for accurate alignment, which is crucial for capturing undistorted and complete radiographic images.
Unlike most positioning systems, the Zero Profile® holders secure to the back of the wireless DC-Air™, keeping the imager fixed in the mouth and making it impossible for the sensor to slide out of position for the image.
Exposure Latitude
Another benefit of the direct conversion x-ray technology inside DC-Air™ is that it allows a wider exposure latitude (the range of exposure settings that can be used to achieve a diagnostic image) than conventional sensors. The gallery below shows a series of bitewings acquired with a 70kV, 7mA x-ray source using exposure times from .10s to .320s. Notice the lack of cervical burnout and the diagnostic presentation of oral structures across the complete range of settings:
Intelligent Auto-Image
Another benefit of the direct conversion x-ray technology inside DC-Air™ is that it allows a wider exposure latitude (the range of exposure settings that can be used to achieve a diagnostic image) than conventional sensors. The gallery below shows a series of bitewings acquired with a 70kV, 7mA x-ray source using exposure times from .10s to .320s. Notice the lack of cervical burnout and the diagnostic presentation of oral structures across the complete range of settings:
In conclusion, optimizing image quality in dentistry is a multifaceted process that demands precision in several aspects. With innovations like the DC-Air™ direct conversion technology, dentists can now take advantage of superior image quality, leading to more accurate diagnoses and better patient experiences. Through understanding and utilizing the right tools and technology, dentists can greatly enhance the effectiveness and efficiency of their practice’s diagnostic imaging.
For more information on the DC-Air™, including pricing, please contact our FTG Imaging team at 855-664-1953 or info@ftgimaging.com.
References
Mounce, R. (2016). Maximizing the lifespan of the digital sensor. Dentaltown, 74-77. Retrieved from https://www.dentaltown.com/Images/dentaltown/magimages/0716/MBXRpg74.pdf
FTG Imaging. (2023). DC-Air™ Product Sheet. Retrieved from https://ftgimaging.com/wp-content/uploads/2023/02/DC-Air-Product-Sheet-2023-Compressed-1.pdf
Athlos Oy. (2023). DC-Air™ Environmental Testing Report. Retrieved from https://9299038.fs1.hubspotusercontent-na1.net/hubfs/9299038/DC-AirTM%20Environmental%20Testing%20Report-1.pdf