Executive Summary

Located on site at busy Armadale Hospital, Perth Radiological Clinic (PRC) is in one of Western Australia’s fastest-growing regions. The clinic sees a wide variety of patients and 12 months ago needed a replacement CT system that could manage a burgeoning workload and efficiently deliver high quality images at optimised dose, across a broad range of clinical examinations.  

The number of patients attending the PRC Armadale site is increasing on a monthly basis. While at its busiest during the day, the CT scanner operates 24 hours to meet the needs of hospital inpatients, emergency cases and people referred by local physicians. Cancer patients also present at the clinic for preliminary studies, pre-treatment starting scans and follow-up studies.  

The Facility
Perth Radiological Clinic is located onsite at Armadale Hospital, south of Perth in Western Australia, and provides CT, ultrasound and X-ray services to a broad range of people including hospital inpatients, emergency and private health patients.  

• Using ASiR™ the PRC Armadale site achieves, up to 40% dose reduction for chest and abdomen scans.
• The Optima CT660 has 60% less energy consumption than legacy scanners.


According to Philip Allerton, CT Supervisor at the PRC Armadale site, when the time came for the clinic to upgrade its CT system, there were a number of features considered critical to the decision-making. It was essential that the new scanner be capable of providing a streamlined workflow to assist the clinic in managing an increasing patient work load. It was also necessary that it have the technology capable of generating high quality clinical images with dose optimising solutions. The PRC site chose the latest-generation multidetector, Optima™ CT660 scanner.


Traditionally, lowering CT dose increases noise and can impact the quality of the diagnostic images required in today’s clinical environment. To overcome this conventional CT challenge and achieve As Low As Reasonably Achievable (ALARA) dose levels, the Optima CT660 uses a specialised dose reduction technique and breakthrough reconstruction technology called ASiR™ (Adaptive Statistical Iterative Reconstruction).

ASiR** is a projection-based iterative reconstruction technology that changes the dose paradigm across many patients. It reduces the issues of noise and image artefacts at low dose by actually removing noise instead of masking it.  

The PRC Armadale site continually reviews the dose levels it uses in its CT imaging. Following installation of the Optima CT660 12 months ago, the clinic has used ASiR on all of its scans which is particularly important for paediatric imaging, to achieve a lowdose, high-yield performance.  

“Having reviewed scan dose levels for the past three years – two years with our previous scanner and one year with the Optima CT660 - we have been able to get a really good comparison. In the past 12 months, we’ve seen up to 40% dose reduction for most of our imaging,” Mr Allerton said. “this is a really positive outcome for our patients.”  

In other clinical examinations, the Optima CT660 has achieved outstanding results with ASiR.


Mr Allerton said one patient had a repeat chest scan for a pulmonary nodule at 12 months and with the Optima CT660, there was an 88% dose reduction (655.2mg.cm to 78.77mg.cm). According to Mr Allerton, feedback from hospital doctors and local GPs indicated that they preferred to refer patients for lower dose CT imaging.  

“Referring doctors have greater peace of mind being able to refer people for a scan, knowing that they can still get a quality image without the higher dose necessary on our previous scanner. They like to know that we’re doing the right thing by their patients when they refer people to our clinic.”  

With its compact footprint and modular design, the Optima CT660 is smaller than the clinic’s previous scanner, taking up less space in the scanning room, freeing up valuable working room and enabling the clinic staff to better meet the needs of their patients.  

The scanner also has scalability from 64 to 128 slices, enabling clinics to manage growth based on their clinical and business needs.  

As the latest-generation scanner, the Optima CT660 takes CT scanning capabilities to a whole new level and will enable the PRC Armadale site to easily expand its use to advanced applications in cardiovascular, oncology, neurology, angiography and other fields, in the future if required.  

Improved Workflow
“With its reduced rotation time, the Optima CT660 provides a faster scan and helps the clinic better manage its patient workflow. Abdominal and chest scans can be completed in approximately 3 to 10 seconds whereas previously, scan times for each was about 20 seconds.”  

The clinic uses the scanner’s Xtream Display, which is a 12-inch colour monitor mounted at the top of the gantry. It can be used to display animated videos explaining to patients how a CT exam works, show relaxing scenes to calm paediatric patients or highlight personalised patient information to improve patient safety.  

The Optima CT660 has an ergonomic design with new convenience features such as automatic patient positioning capability. This helps reduce the time involved for staff to manually position patients on the table – typically, one of the most time-consuming tasks involved in the exams.  

Reduced Energy Consumption
It is also among the world’s most energy efficient CT systems, using up to 60% less energy consumption than legacy scanners. GE’s Optima CT660 is the first CT system that is both ecomagination and healthymagination certified. These two global initiatives are aimed at transforming healthcare delivery through innovation, partnerships and sustainability.  

The Optima CT660 is the ideal scanner for virtually any radiology department seeking eco-friendly, low power consumption, patient comfort, fast workflow and low-dose scanning capability while delivering quality diagnostic images.


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