Comput Math Methods Med - Low-dose and scatter-free cone-beam CT imaging using a stationary beam blocker in a single scan: phantom studies.

Tópicos

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Resumo

Excessive imaging dose from repeated scans and poor image quality mainly due to scatter contamination are the two bottlenecks of cone-beam CT (CBCT) imaging. Compressed sensing (CS) reconstruction algorithms show promises in recovering faithful signals from low-dose projection data but do not serve well the needs of accurate CBCT imaging if effective scatter correction is not in place. Scatter can be accurately measured and removed using measurement-based methods. However, these approaches are considered unpractical in the conventional FDK reconstruction, due to the inevitable primary loss for scatter measurement. We combine measurement-based scatter correction and CS-based iterative reconstruction to generate scatter-free images from low-dose projections. We distribute blocked areas on the detector where primary signals are considered redundant in a full scan. Scatter distribution is estimated by interpolating/extrapolating measured scatter samples inside blocked areas. CS-based iterative reconstruction is finally carried out on the undersampled data to obtain scatter-free and low-dose CBCT images. With only 25% of conventional full-scan dose, our method reduces the average CT number error from 250HU to 24HU and increases the contrast by a factor of 2.1 on Catphan 600 phantom. On an anthropomorphic head phantom, the average CT number error is reduced from 224HU to 10HU in the central uniform area.

Resumo Limpo

excess imag dose repeat scan poor imag qualiti main due scatter contamin two bottleneck conebeam ct cbct imag compress sens cs reconstruct algorithm show promis recov faith signal lowdos project data serv well need accur cbct imag effect scatter correct place scatter can accur measur remov use measurementbas method howev approach consid unpract convent fdk reconstruct due inevit primari loss scatter measur combin measurementbas scatter correct csbase iter reconstruct generat scatterfre imag lowdos project distribut block area detector primari signal consid redund full scan scatter distribut estim interpolatingextrapol measur scatter sampl insid block area csbase iter reconstruct final carri undersampl data obtain scatterfre lowdos cbct imag convent fullscan dose method reduc averag ct number error hu hu increas contrast factor catphan phantom anthropomorph head phantom averag ct number error reduc hu hu central uniform area

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