Medical imaging plays a critical role in diagnosis, treatment planning, and patient monitoring. The goal is not only to acquire high-quality images, but to ensure each exam provides meaningful clinical information, while keeping radiation exposure at an appropriate level. This is where dose-efficient imaging becomes essential.
There is increasing interest in imaging approaches that optimize dose while capturing as much clinical information as possible.
What many get wrong about dose-efficient imaging is that it’s more than just the “lowest dose possible”, it is about what your X-ray system can achieve relative to the radiation dose used. Does the diagnostic information an X-ray image provides justify — or even outweigh — the dose it requires?
In this article, we’ll dive into:
- Why dose-efficient imaging is important.
- Why dose-efficient imaging is more than just “the lowest dose”.
- Why radiation exposure is a major consideration in clinical settings.
- How the Reveal 35C dual-energy X-ray achieves dose-efficient imaging.
What is Dose-efficient imaging?
Dose-efficient imaging is achieving the optimal balance between radiation dose and diagnostic image quality, while maximizing the clinical information available from each exposure.
A common misconception is that dose-efficient imaging means using the lowest dose possible. This often isn’t the case, as the “lowest possible dose” will depend on how the image is made and who is making the final diagnosis. In some cases the image quality and the amount of clinical information available in the final X-ray image may be compromised if the dose is so low that the resulting image becomes undiagnostic. This can lead to the need for retakes, which ultimately exposes the patient to more radiation than was originally required to create a diagnostic image.
When are X-ray systems considered Dose-efficient?
A dose-efficient X-ray system must be able to maintain good diagnostic image quality while using an efficient and appropriate dosage of radiation.
The Reveal™ 35C detector supports dose-efficient imaging by creating a high-quality standard DR image and two additional dual energy radiographic images from a single exposure. This is done by utilizing three separate scintillation layers within the Reveal™ 35C detector with high DQE at a radiation dose comparable to or better than a standard chest X-ray under typical imaging conditions.
Importantly, the two additional dual energy images are created during the same exposure as the standard DR image without the need for additional exposures or increasing radiation dose.
While the radiation dosage used for Reveal™ 35C detector is comparable to standard chest X-ray exposure, it provides additional clinical information from the same exposure, making it a more dose-efficient option in various clinical cases. The Reveal 35C detector, powered by SpectralDR® technology, produces a standard DR image, a soft tissue image, and a bone/high-calcium image. All three images provide unique clinical information and may assist clinicians in identifying diagnostic indicators that can be less visible in standard DR images.
How does Detective Quantum Efficiency (DQE) influence dose?
An X-ray system’s DQE indicates how efficiently the detector converts X-ray photons into a diagnostic-quality image.
The DQE of a detector influences the amount of radiation required to create a diagnostic image. As such, it directly relates to the dose-efficiency of the system. Low DQE detectors generally require a higher radiation dose and convert X-rays less efficiently, while detectors with high DQE can be used with lower radiation doses.
The Reveal 35C is a prime example of a high DQE detector (67% at 1 lp/mm), thus it is more efficient and can produce high image quality diagnostic DR images at lower doses.
Learn More: What Is DQE? A Deep Dive into Detective Quantum Efficiency
How does dual-energy imaging affect patient dose?
Most standard dual-energy imaging technologies require multiple exposures at different energy levels, with each additional exposure increasing the radiation dose to the patient. This can result in a significantly higher overall dose when creating dual energy images.
The Reveal 35C detector is different. It is powered by SpectralDR® technology, which produces dual-energy images with a single exposure, eliminating the need for the multiple exposures required with traditional dual-exposure dual-energy approaches.
Why is Dose-efficient Imaging Important?
Every X-ray exam exposes patients to radiation. While individual doses are typically low, cumulative exposure over time—especially for patients requiring frequent imaging—can increase long-term health risks.
Large-scale studies have suggested that radiation from imaging—particularly CT—may contribute to a small proportion of cancer cases at a population level. At the same time, the clinical benefits of imaging remain clear, and when used appropriately, these exams provide essential diagnostic value.
In this context, there is a growing focus on how to obtain the most clinically meaningful information from each exam, while appropriately managing radiation exposure.
If the dose is too high, it introduces unnecessary exposure. If it’s too low, image quality suffers, which could lead to repeat scans.
Dose-efficient imaging optimizes doses, ensuring that:
- Patients receive the minimum dose required to produce a high-quality image
- Clinicians obtain consistent diagnostic-quality images
- Patients are not exposed to unnecessary repeat exams
- Facilities align with the ALARA principle (As Low As Reasonably Achievable)
What happens when the dose is too high OR too low?
In clinical settings, managing patient radiation exposure is vital. When the dose is not optimized, it can lead to various issues:
If the dose is too high, it can lead to:
- Unnecessary radiation exposure
- The possibility of oversaturated undiagnostic images
- Inefficient imaging practices
- Regulatory issues
If the dose is too low, it can lead to:
- Increased image noise and poor image quality
- Incomplete or unreliable diagnostic information
- Higher likelihood of repeated imaging (increasing total dose)
It’s important to understand that managing patient radiation exposure doesn’t mean reducing the dose as much as possible. In many cases, aggressively reducing dose can actually backfire, potentially leading to nondiagnostic images, repeated exams, more time spent, and ultimately more exposure overall.
What Is the Most Effective Way to Optimize Patient Dose?
The most effective approach to optimize patient dose is not just by X-ray technique adjustment alone, it is by using technology which is designed to operate within an optimal dose range.
Modern dose-efficient imaging solutions focus on:
- Maximizing diagnostic information when using a proper exposure technique
- Maintaining consistent image quality across multiple patients and use cases
- Reducing the need for retakes
The Reveal 35C dual-energy X-ray detector, powered by SpectralDR technology, is designed to operate within a clinically appropriate exposure range, using the most efficient technology to optimize dose while maximizing diagnostic image quality and information. All this is achieved without increasing radiation dose.
Understanding KA’s Spectral Imaging and Dose-optimization
Dual-energy X-ray technology provides additional diagnostic insight by separating anatomical structures, such as bone and soft tissue.
KA Imaging has developed a dual-energy, single-exposure system that captures multiple image data sets simultaneously using a radiation dose comparable to a standard chest X-ray under typical imaging conditions.
The system is designed to work within a clinically appropriate exposure range, ensuring there is sufficient signal for accurate material separation.
The result is:
- Enhanced visualization of tissue and bone details without requiring multiple exposures
- Reliable subtraction performance
- Consistent image quality across various types of exams
Does Spectral Imaging Require Additional Exposures?
In traditional systems, dual-energy imaging requires multiple exposures at different energy levels. This creates challenges such as:
- Increased total radiation dose
- Motion artifacts between exposures
- Workflow inefficiencies
KA Imaging’s Reveal 35C overcomes this by capturing dual-energy data in a single exposure.
That said, using the optimal radiation dose is still important. Spectral X-ray imaging depends on having sufficient signal to accurately separate materials. Without that, image quality may be insufficient for reliable material separation.
Attempting to operate at ultra-low dose levels can compromise the quality of the final images and necessitate repeat scans.
How Does the Reveal 35C Dual-Energy X-ray Enable Dose-Optimized Imaging?
The Reveal 35C is designed around the principle of getting the best possible image from a properly optimized exposure.
It supports dose-efficient imaging through:
Single-Exposure Dual-Energy Capture
Reveal captures three spectral images in one acquisition: a traditional DR, a soft tissue, and a bone image. This is achieved using our patented three-layer design with high DQE, avoiding the need for multiple exposures.
Operation Within an Optimal Dose Range
Reveal is designed to reliably produce multiple spectral images using radiographic doses comparable to a standard DR chest X-ray. This supports dose-efficient imaging that doesn’t degrade image quality.
Reliable Material (Tissue and Bone) Separation
Reveal can accurately and consistently support material separation of bone and soft tissue. Depending on the use case, this capability can reveal additional diagnostic details that would otherwise be hard to detect using standard DR images, at similar exposure techniques.
Designed to Minimize the Need for Repeat Exposures
In those cases where a standard DR image may not be sufficient, creating multiple image types (standard DR, bone and soft tissue images) from a single exposure can provide further clinical information, without requiring additional exams or exposures.
Conclusion
Dose-efficient imaging is no longer just about pushing doses as low as possible; it’s about using each exposure more effectively.
By focusing on obtaining all the meaningful clinical information possible from an image with optimized dose, healthcare professionals can support more informed decision-making while maintaining appropriate radiation (ALARA) exposure.