A comparative study for spatial resolution and subjective image characteristics of a multi-slice CT and a cone-beam CT for dental use.

PURPOSE Multi-slice CT (MSCT) and cone-beam CT (CBCT) are widely used in dental practice. This study compared the spatial resolution of these CT systems to elucidate which CT modalities should be selected for various clinical cases. MATERIALS AND METHODS As MSCT and CBCT apparatuses, Somatom Sensation 64 and 3D Accuitomo instruments, respectively, were used. As an objective evaluation of spatial resolution of these CT systems, modulation transfer function (MTF) analysis was performed employing an over-sampling method. The results of MTF analysis were confirmed with a line-pair test using CATPHAN. As a subjective evaluation, a microstructure visualization ability study was performed using a Jcl:SD rat and a head CT phantom. RESULTS MTF analysis showed that for the in-plane direction, the z-axis ultrahigh resolution mode (zUHR) of the Sensation 64 and 3D Accuitomo instruments had higher spatial resolutions than the conventional mode (64×) of the Sensation 64, but for the longitudinal direction, the 3D Accuitomo had clearly higher spatial resolution than either mode of the Sensation 64. A line-pair test study and microstructure visualization ability studies confirmed the results for MTF analysis. However, images of the rat and the CT phantom revealed that the 3D Accuitomo demonstrated the failure to visualize the soft tissues along with aliasing and beam-hardening artifacts, which were not observed in the Sensation 64. CONCLUSIONS This study successfully applied spatial resolution analysis using MSCT and CBCT systems in a comparative manner. These findings could help in deciding which CT modality should be selected for various clinical cases.

[1]  P. Herzog,et al.  Beam hardening artefacts occur in dental implant scans with the NewTom cone beam CT but not with the dental 4-row multidetector CT. , 2007, Dento maxillo facial radiology.

[2]  H. Otero,et al.  Initial evaluation of coronary images from 320-detector row computed tomography , 2008, The International Journal of Cardiovascular Imaging.

[3]  Akitoshi Katsumata,et al.  Effects of image artifacts on gray-value density in limited-volume cone-beam computerized tomography. , 2007, Oral surgery, oral medicine, oral pathology, oral radiology, and endodontics.

[4]  E Honda,et al.  Modulation transfer function evaluation of cone beam computed tomography for dental use with the oversampling method. , 2010, Dento maxillo facial radiology.

[5]  K Araki,et al.  Characteristics of a newly developed dentomaxillofacial X-ray cone beam CT scanner (CB MercuRay): system configuration and physical properties. , 2004, Dento maxillo facial radiology.

[6]  G. Hounsfield,et al.  Computerized transverse axial tomography. , 1973, The British journal of radiology.

[7]  E Tammisalo,et al.  Development of a compact computed tomographic apparatus for dental use. , 1999, Dento maxillo facial radiology.

[8]  Masao Araki,et al.  Comparison of image performance between cone-beam computed tomography for dental use and four-row multidetector helical CT. , 2006, Journal of oral science.

[9]  C H McCollough,et al.  Novel ultrahigh resolution data acquisition and image reconstruction for multi-detector row CT. , 2007, Medical physics.

[10]  M. Ivanovic,et al.  Comparative dosimetry of dental CBCT devices and 64-slice CT for oral and maxillofacial radiology. , 2008, Oral surgery, oral medicine, oral pathology, oral radiology, and endodontics.

[11]  J. Boone,et al.  Evaluation of the spatial resolution characteristics of a cone-beam breast CT scanner. , 2006, Medical physics.

[12]  P. Suetens,et al.  A comparison of jaw dimensional and quality assessments of bone characteristics with cone-beam CT, spiral tomography, and multi-slice spiral CT. , 2007, The International journal of oral & maxillofacial implants.