“Modern medical imaging depends on an enormous amount of engineering that the clinician or patient will never see,” said Shravan Govindaraj, senior product marketing manager at XP Power. “Whether we are looking at MRI, PET or ultrasound, the power system must support precise and repeatable performance while meeting demanding requirements around patient safety, EMC, thermal management and long-term reliability.
“As imaging systems become smaller, more connected and, in some cases, increasingly portable, balancing those requirements becomes more complex. Power architecture therefore needs to be considered as part of the system design from the outset, rather than as a secondary component choice.”
Precision starts with clean, stable power
Shravan notes, “When we talk about advances in MRI, PET and ultrasound, attention naturally goes to image quality, processing capability and what the clinician can see. But all of that depends on a power system delivering clean, stable and repeatable performance behind the scenes.
“Medical imaging electronics can be highly sensitive to electrical noise and power instability. If the power architecture introduces excessive EMI, heat or variation in voltage and current, it can create problems elsewhere in the system. The challenge for engineers is therefore not simply supplying enough power, but supplying it in a way that supports the precision the imaging platform requires,” he adds.
“That becomes increasingly important as systems become more sophisticated. Efficient power conversion, good thermal management and monitoring capabilities can all help engineers maintain reliable performance while giving them greater visibility over the health of the power system.”
Safety must coexist with performance
“Safety and performance cannot be treated as separate engineering challenges in medical imaging. Requirements around isolation and leakage current under IEC 60601-1 must be considered alongside EMC requirements, because decisions made to address one area can have consequences elsewhere in the design,” Shravan explains.
“Patient leakage current is a good example. Engineers may need to carefully manage capacitance and isolation to keep leakage within the required limits, while at the same time ensuring the system has the filtering and EMC performance it needs. That is a balancing exercise rather than a single specification that can be solved in isolation.”
He continues, “This is why power needs to be considered early in the development process. If isolation, leakage current, thermal behaviour and EMC are only addressed towards the end of a project, engineers have much less freedom to optimise the overall system. Choosing appropriately approved medical power supplies early can help reduce integration challenges and support the route towards compliance.”
Smaller systems create tighter thermal and space trade-offs
“The move towards smaller and more portable medical equipment creates a very different set of engineering pressures,” he adds. “Increasing power density helps reduce the size of the system, but putting more power into less space inevitably makes thermal management more challenging.
“Cooling is particularly important because the obvious solution is not always appropriate. Adding fans, for example, can introduce audible noise and additional mechanical components, while sealed or fanless equipment places more emphasis on efficient conversion and effective conduction or convection cooling.”
Shravan explains further, “Portability is also about much more than reducing physical size. Engineers may need equipment to operate across different power sources and clinical environments while maintaining the same expectations for safety and reliability. Wide input ranges, efficient conversion and compact power architectures can give designers more flexibility to achieve that.
“As imaging platforms continue to evolve, scalability also becomes valuable. A configurable power architecture with programmable outputs, alarms and health monitoring can make it easier to accommodate future changes without having to rethink the entire power system.”
Engineering for the next imaging platform
“One of the biggest engineering challenges in modern medical imaging is that these requirements do not exist independently. Engineers are trying to achieve precise electrical performance without introducing unwanted noise, meet stringent patient-safety requirements while maintaining EMC performance, increase power density without creating excessive heat, and build in flexibility without compromising long-term reliability,” Sharavan concludes.
“Those trade-offs are becoming more significant as MRI, PET and ultrasound systems become more compact, connected and capable. The power architecture has to evolve alongside the imaging technology rather than being treated as a component that can simply be selected at the end of the design process.
“Image quality and clinical capability are ultimately what the user sees, but there is a considerable amount of engineering behind those outcomes. A power system that is safe, low-noise, efficient, reliable and adaptable gives the rest of the imaging platform a much stronger foundation.”
