A FULLY INTEGRATED SPECT/FAC APPROACH THAT OFFERS SUPERB QUALITY, HIGH SPEED AND UNMATCHED CLINICAL PRECISION.
The X-ACT elevates the performance and clinical confidence of myocardial perfusion imaging studies (MPI) to a level that was unimaginable, until now. Rapid emission imaging is made possible through the use of Digirad’s proprietary high count-rate, solid-state high-definition detectors (HDSD); high-efficiency triple-head geometry; high sensitivity fanbeam collimators; and rapid 3D-OSEM reconstruction techniques. Rapid transmission imaging is made possible by the use of a novel mono-energetic X-ray line source. Not only is imaging fast, but the images are of consistent outstanding quality, patient to patient, day after day.
The X-ACT represents an advanced genre of fully-integrated SPECT/FAC designs where high-speed solid-state detectors have the ability to collect both the emission and the transmission data, eliminating the need to move the patient between the emission and transmission data collections, providing greatly improved registration accuracy and efficiency over alternative in-line SPECT/VCT approaches. The 27 inch [69cm] wide FOV low dose fluorescence attenuation correction approach delivers 80 times more counts than isotopic techniques with 3.5 times less noise during a short, 1 minute scan that encompasses approximately 10 to 15 respiratory cycles. The results, the transmission images are free of truncation or beam hardening artifacts and the respiratory co-registration of the E/T data sets is excellent. These are key reasons why the quality of studies performed on the X-ACT are so good. To top it off, the patient radiation exposure is a low 5 microsieverts, or nearly 100 to 1,000 times lower than other commercially available CT-based AC approaches.
The open upright design of the X-ACT makes the system very patient- friendly, which is a big contrast from the deep tunnel-like supine imaging designs of other SPECT/CT systems. The open design and wide orbit radius enables you to image claustrophobic, COPD and bariatric patients up to 500 lbs [227kg]. Since the diaphragm lowers when patients are imaged upright, you also get better separation of the heart from the liver and bowels, so artifacts from overlying activities are significantly reduced. The small size of the detectors mean a patient’s arms do not have to be raised nearly as high, as with ‘Anger’ systems and it is possible to bring the detectors tight to the patient’s chest, ensuring consistent high image quality results, for patients of any size. Patient motion is minimized by use of a saddle-seat that provides passive resistance to sliding and the use of Digirad’s fully-automated STASYS™ motion correction software - and of course, fast imaging.