http://www.cnr.it/ontology/cnr/individuo/prodotto/ID202667

Analysis of image sharpness reproducibility on a novel engineered micro-CT scanner with variable geometry and embedded recalibration software (Articolo in rivista)

Type

Prodotto della ricerca (Classe)
Articolo in rivista (Classe)

Label

Analysis of image sharpness reproducibility on a novel engineered micro-CT scanner with variable geometry and embedded recalibration software (Articolo in rivista) (literal)

Anno

2012-01-01T00:00:00+01:00 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi

10.1016/j.ejmp.2011.03.006 (literal)

Alternative label

Panetta, Daniele (1); Belcari, Nicola (2); Del Guerra, Alberto (2); Bartolomei, Argeo (3)Salvadori, Piero A. (1); (2012)
Analysis of image sharpness reproducibility on a novel engineered micro-CT scanner with variable geometry and embedded recalibration software
in Physica medica (Testo stamp.)
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

Panetta, Daniele (1); Belcari, Nicola (2); Del Guerra, Alberto (2); Bartolomei, Argeo (3)Salvadori, Piero A. (1); (literal)

Pagina fine

166 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#altreInformazioni

ID_PUMA: cnr.ifc/2011-A0-156. - Received 31 January 2011; received in revised form 16 March 2011; accepted 22 March 2011 Available online 17 April 2011 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume

28 (literal)

Rivista

Physica medica (Rivista)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali

173 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo

2 (literal)

Note

ISI Web of Science (WOS) (literal)
Scopu (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

(1) CNR-IFC, Pisa; (2) Dipartimento di Fisica, Università di Pisa; (3) Argos Engineering s.r.l, Candeglia, Italy (literal)

Titolo

Analysis of image sharpness reproducibility on a novel engineered micro-CT scanner with variable geometry and embedded recalibration software (literal)

Abstract

This study investigates the reproducibility of the reconstructed image sharpness, after modifications of the geometry setup, for a variable magnification micro-CT (mCT) scanner. All the measurements were performed on a novel engineered mCT scanner for in vivo imaging of small animals (Xalt), which has been recently built at the Institute of Clinical Physiology of the National Research Council (IFC-CNR, Pisa, Italy), in partnership with the University of Pisa. The Xalt scanner is equipped with an integrated software for on-line geometric recalibration, which will be used throughout the experiments. In order to evaluate the losses of image quality due to modifications of the geometry setup, we have made 22 consecutive acquisitions by changing alternatively the system geometry between two different setups (Large FoV e LF, and High Resolution e HR). For each acquisition, the tomographic images have been reconstructed before and after the on-line geometric recalibration. For each reconstruction, the image sharpness was evaluated using two different figures of merit: (i) the percentage contrast on a small bar pattern of fixed frequency (f Z 5.5 lp/mm for the LF setup and fZ10 lp/mm for the HR setup) and (ii) the image entropy. We have found that, due to the small-scale mechanical uncertainty (in the order of the voxel size), a recalibration is necessary for each geometric setup after repositioning of the system's components; the resolution losses due to the lack of recalibration are worse for the HR setup (voxel size Z 18.4 mm). The integrated on-line recalibration algorithm of the Xalt scanner allowed to perform the recalibration quickly, by restoring the spatial resolution of the system to the reference resolution obtained after the initial (off-line) calibration. (literal)

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