Back to the list
Congress: ECR25
Poster Number: C-20461
Type: Poster: EPOS Radiologist (scientific)
DOI: 10.26044/ecr2025/C-20461
Authorblock: R. Villa, N. Paruccini, E. De Ponti; Monza/IT
Disclosures:
Raffaele Villa: Nothing to disclose
Nicoletta Paruccini: Nothing to disclose
Elena De Ponti: Nothing to disclose
Keywords: Radiation physics, Radioprotection / Radiation dose, CT, Image manipulation / Reconstruction, Observer performance, Physics, Radiation safety, Dosimetric comparison, Quality assurance
Purpose First-generation IR algorithms were mainly focused on simple noise reduction; radiologists complained about a blotchy image appearance. Second-generation algorithms are generally of the so-called statistical type. These algorithms take the statistical noise distribution into account. They typically exhibit fewer IR artifacts, whilst allowing increased noise reduction. Model or knowledge-based IR algorithms represent the third generation. They incorporate detailed physics knowledge of photon-target interaction, x-ray tube emission, detector element cross-talking, into the image reconstruction process, which permits much more accurate and patient-specific...
Read more Methods and materials In this study DL, 2nd and 3rd generation IR algorithms of two different CT manufacturers were investigated. Vendor 1 permits the reconstruction of both generations of IR algorithms on the same device. For Vendor 2 every system features only one kind of IR algorithm, the newest one is only available on top-end systems. Similarly, Vendor 1, equipped with DL Algorithm features only 2nd generation IR algorithms. Hence image acquisitions had to be carried out on two different scanners.Furthermore, each scanner...
Read more Results Noise PropertiesAs illustrated in Figure 4, the normalised NPS profiles obtained with FBP and 2nd and 3rd generation IR, as well as the Deep Learning Reconstruction Algorithm, are presented.The transition from FBP to iDose and IMR of increasing strength has been shown to not only reduce the noise level, but also shift the spectrum towards lower frequencies. The shift of the peak frequency was found to be minimal for 2nd generation IR (iDose, on average Df < -0.05 mm-1), however,...
Read more Conclusion The transition from the second to the third generation of IR algorithms resulted in enhancements across all aspects of image quality. The more advanced IMR algorithm demonstrated superior noise suppression in comparison to iDOSE, suggesting the potential for dose reduction, enhanced spatial resolution, and higher d' scores.Conversely, the third generation IR ADMIRE did not demonstrate equivalent improvements to the second generation IR SAFIRE. The ASIR-V exhibited comparable enhancements to the second generation algorithm. However, it is important to note that...
Read more References [1]    Willemink M, Leiner T, de Jong PA, et al. Iterative reconstruction techniques for computed tomography part 2: initial results in dose reduction and image quality. 2013 European Radiology 23(6): 1632-1642. https://doi.org/10.1007/s00330-012-2764-z.[2]    McCollough CH, Chen GH, Kalender W, et al.  Achieving routine submillisievert CT scanning: report from the summit on management of radiation dose in CT. 2012 Radiology  264(2):567-580. https://pubs.rsna.org/doi/pdf/10.1148/radiol.12112265.[3]    Solomon J, Wilson J, Samei E. Characteristic image quality of a third generation ual-source MDCT scanner: Noise, resolution, and...
Read more
GALLERY