What is Veterinary Digital Radiography, and How Does It Compare to Film X-Ray Systems?
Nowadays, veterinarians have a lot of options when it comes to their x-ray system—so how does a veterinary practice choose between film and the various digital x-ray modalities that are available?
It helps to compare price, efficiency, and other factors that will affect the daily use and value of your investment. Here are some considerations…
What Is Digital Radiography Versus Film?
First, it’s helpful to define the different x-ray options that are used in veterinary medicine.
The first choice is to decide between film or digital radiography. Film is exactly what it sounds like: X-ray images are captured on physical films. To produce an image, those films are then developed using processing chemicals in a dark room.
Digital radiography, on the other hand, produces a digital image. However, there is more than one method available for obtaining this image, including CCD, CR, and DR.
CCD (charge-coupled devices) have been compared to digital cameras in the way that they work. However, they have some disadvantages, including edge distortion when collimation is wider. While this older technology is still used in some capacities, most vets would be choosing between CR or DR.
CR (computed radiography) uses phosphor plates to capture an image. That image is obtained when a plate is put through a plate reader.
DR (direct radiography) doesn’t have any type of “middleman” (film developer or plate reader). Instead, digital images are captured on a special type of x-ray sensor that directly or indirectly converts x-rays into an electrical signal. The image is produced almost instantaneously.
Costs of Digital Radiography Versus Film
As with many other technological advances, there tends to be an increase in price for newer generations of technology—at least initially, because newer technology eventually does come down in price and becomes more accessible. Compare it to smartphones and digital cameras—two type of technology that have become much more widely accessible in recent years.
X-ray technology has followed a similar pattern. Digital technology does generally cost more to purchase than a film system. And DR generally costs more than CR.
That being said, prices have come down significantly in the last decade or so, making digital technology much more affordable to many veterinary practices.
While it’s great that newer technology is becoming more affordable, that doesn’t mean the latest tech is right for every veterinary practice. For practices with a slower pace that don’t perform a lot of x-ray studies, a film or CR system may meet their needs just fine and be a smarter investment than DR.
It’s also important to consider long-term maintenance and repair costs, in addition to the purchase price of the x-ray system.
For example, is there a warranty, and what does it cover?
If a component of the machine or plate/sensor breaks down, are replacement parts available (that’s not always the case for older equipment)?
Also, for film, the cost of supplies (film purchase and disposal, processing chemicals, and developer maintenance) must also be factored in.
Efficiency of Digital Radiography Versus Film
There’s not doubt that, used to its maximum potential, DR technology is fast and efficient. That’s because, rather than waiting on a developer or plate reader, images are created in just a few seconds.
This efficiency can make x-ray studies go much faster, with fewer retakes. Also, for digital systems in general, it’s usually faster to set up the study, since there are automatic technique settings for different patient sizes and areas of the body being studies.
All of this means a faster, simpler workflow, less time for the patient to be on the x-ray table, and the potential to schedule more x-ray studies. Many practices have reported increasing their x-ray revenue after upgrading to DR. This can certainly increase the financial return on the equipment investment.
But there is one important consideration when it comes to efficiency. The machine is only efficient if team members feel confident using it. So, it’s ideal to invest in something that’s user friendly and that has tech support available.
It’s smart to invest time to train everybody on the new equipment, since many employees will be used to different systems and need a little help learning all the features and functions of the new equipment.
Quality of Digital Radiography Versus Film
While many vet professionals believe digital radiography is always better quality than film, that’s not necessarily true.
Quality depends on the system itself, as well as on the ability of team members to use the equipment proficiently to obtain high-quality, diagnostic images. Performed with skill, film studies can be perfectly diagnostic and of high quality.
That being said, digital does allow some room for error. A lot of practitioners like it for that reason. The software automates much of the image processing, and the digital image can be manually manipulated if something needs to be seen in more detail.
Which Is Best—Digital Radiography or Film?
Digital x-ray technology, particularly DR, certainly offers many advantages. And it may make sense to invest in the latest technology that a veterinary business can reasonably afford, so that replacement parts and tech support are available for as many years as possible.
However, each veterinary practice must evaluate their unique needs and see what works best for them.
Written by: Dr. Tammy Powell, DVM
