Pancreatitis   follow-up on young patient

"In this young patient who will need repeat follow-up CT exams for both pancreatitis and testicular cancer, the main challenge is the cumulated dose that this patient will receive over the years.
Thanks to high capabilities of dose reduction with ASiR-V,we were able to dramatically decrease DLP and CTDi , without any compromise in image quality".

Dr. Marc Zins
Head of Radiology service,
Groupe Hospitalier Paris Saint Joseph, Paris, France

Clinical Case

Patient history

A young man in his 20's with testicular cancer was referred to CT for follow-up of post-surgery pancreatitis after a lumbo-aortic lymphadenectomy, with hepatic metastasectomy.

These 2 exams have been scanned within one week.

Acquisition

  Optima CT660 Revolution EVO
Acquisition mode Helical Helical
kV 120 100
BMI 24 24
IR ASiR ASiR-V
DLP (mGy.cm) 1074 412
CTDi (mGy) S1 arterial 7.9 4.5
CTDi (mGy) S2 portal  12.2 4.9


Results

Optima CT660

Revolution EVO

Enabling Technologies

For Revolution EVO, we redesigned the entire imaging chain using the new Clarity detector inherited from the breakthrough technology introduced on Revolution CT. 

ASiR-V comes standard and focuses primarily on more advanced noise and object modeling with added physics modeling to help reduce noise, improve low-contrast detectability, and reduce artifacts

  • Routinely image with up to 82% less dose1,2. Combining the speed of ASiR* with added capabilities from Veo* full model-based iterative reconstruction, the novel ASiR-V* iterative reconstruction algorithm brings low dose and improved quality to routine imaging. 

  • Up to 100% better spatial resolution. ASiR-V has the capability to improve spatial resolution compared to FBP by allowing the reconstruction of higher-resolution images with no increase in image noise. 

  • Up to 135% improved low-contrast detectability. ASiR-V improves the detectability of low-contrast objects by up to 135% when compared to corresponding FBP reconstructions at the same dose.

  • Up to 91% less image noise. Depending upon the scan technique and reconstruction parameters, ASiR-V can significantly reduce electronic image noise compared to FBP at the same dose. 

  • Less streak artifact. ASiR-V has the capability to reduce low-signal artifact, such as streak artifact, compared to FBP.

Conclusion

The significant dose reduction using the new generation of iterative reconstruction ASiR-V, allowed the customer to manage a better follow-up of this young patient, with high image quality and less than half dose.


1 Low contrast detectability (LCD), image noise, spatial resolution and artifacts were assessed using reference factory protocols comparing ASiR-V and FBP. The LCD measured in 0.625 mm slices and tested for both head and body modes using the MITA CT IQ Phantom (CCT183, The Phantom Laboratory), using model observer method.

2 In clinical practice, the use of ASiR–V may reduce CT patient dose depending on the clinical task, patient size, anatomical location and clinical practice. A consultationwith a radiologist and a physicist should be made to determine the appropriate dose to obtain diagnostic image quality for the particular clinical task.


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