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journal article 
Bissinger, Oliver; Kirschke, Jan S; Probst, Florian Andreas; Stauber, Martin; Wolff, Klaus-Dietrich; Haller, Bernhard; Götz, Carolin; Plank, Christian; Kolk, Andreas 
Micro-CT vs. Whole Body Multirow Detector CT for Analysing Bone Regeneration in an Animal Model. 
Compared with multirow detector CT (MDCT), specimen (ex vivo) micro-CT (?CT) has a significantly higher (~ 30 x) spatial resolution and is considered the gold standard for assessing bone above the cellular level. However, it is expensive and time-consuming, and when applied in vivo, the radiation dose accumulates considerably. The aim of this study was to examine whether the lower resolution of the widely used MDCT is sufficient to qualitatively and quantitatively evaluate bone regeneration in rats.Forty critical-size defects (5mm) were placed in the mandibular angle of rats and covered with coated bioactive titanium implants to promote bone healing. Five time points were selected (7, 14, 28, 56 and 112 days). ?CT and MDCT were used to evaluate the defect region to determine the bone volume (BV), tissue mineral density (TMD) and bone mineral content (BMC).MDCT constantly achieved higher BV values than ?CT (10.73±7.84 mm3 vs. 6.62±4.96 mm3, p<0.0001) and consistently lower TMD values (547.68±163.83 mm3 vs. 876.18±121.21 mm3, p<0.0001). No relevant difference was obtained for BMC (6.48±5.71 mm3 vs. 6.15±5.21 mm3, p = 0.40). BV and BMC showed very strong correlations between both methods, whereas TMD was only moderately correlated (r = 0.87, r = 0.90, r = 0.68, p< 0.0001).Due to partial volume effects, MDCT overestimated BV and underestimated TMD but accurately determined BMC, even in small volumes, compared with ?CT. Therefore, if bone quantity is a sufficient end point, a considerable number of animals and costs can be saved, and compared with in vivo ?CT, the required dose of radiation can be reduced. 
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Klinik und Poliklinik für Mund-, Kiefer- und Gesichtschirurgie; Abteilung für Neuroradiologie; Institut für Medizinische Statistik und Epidemiologie; Institut für experimentelle Onkologie und Therapieforschung