【摘要】：目的優(yōu)化現(xiàn)有的基于標(biāo)志點(diǎn)的三維影像重疊方法,并在此基礎(chǔ)上提出一種更為簡(jiǎn)便的用以重疊上頜骨三維影像方法。方法對(duì)9名志愿者均間隔1年拍攝2幅錐形束CT(CBCT)影像,比較兩種數(shù)學(xué)運(yùn)算方法(6點(diǎn)優(yōu)化法和8點(diǎn)優(yōu)化法)對(duì)建立ELSA共坐標(biāo)系誤差的優(yōu)化效果。以前后鼻棘點(diǎn)(ANS、PNS)建立用以重疊上頜骨的共坐標(biāo)系(ANS、PNS共坐標(biāo)系)。挑選數(shù)個(gè)標(biāo)志點(diǎn)檢測(cè)影像的重疊誤差,并進(jìn)行統(tǒng)計(jì)學(xué)分析。結(jié)果在未優(yōu)化、6點(diǎn)優(yōu)化、8點(diǎn)優(yōu)化3種方法中,ELSA共坐標(biāo)系建立的平均線距和角度誤差分別為(0.60±0.47)mm和(0.49±0.38)°、(0.44±0.39)mm和(0.48±0.37)°、(0.41±0.34)mm和(0.41±0.32)°,8點(diǎn)優(yōu)化法對(duì)ELSA共坐標(biāo)系建立的平均線距誤差小于無(wú)優(yōu)化和6點(diǎn)優(yōu)化法(P0.05)°ELSA共坐標(biāo)系下各標(biāo)志點(diǎn)重疊的平均線距和角度誤差分別為(0.95±0.50)mm和(1.06±0.65)°、(0.92±0.54)mm和(0.92±0.58)°、(0.80±0.43)mm和(0.87±0.59)°,3種方法差異有統(tǒng)計(jì)學(xué)意義(P均0.000 1)。經(jīng)8點(diǎn)優(yōu)化后,在ELSA、ANS、PNS共坐標(biāo)系中用以重疊上頜骨的各標(biāo)志點(diǎn)的平均線距和角度誤差分別為(0.92±0.47)mm和(1.14±0.66)°、(0.99±0.47)mm和(1.33±0.64)°、(1.00±0.62)mm和(1.08±0.70)°。結(jié)論本研究提出的8點(diǎn)優(yōu)化法可顯著提高ELSA共坐標(biāo)系的準(zhǔn)確性,且所提出的上頜骨三維影像重疊方法的誤差已基本達(dá)到進(jìn)行臨床病例分析的要求范圍。
[Abstract]:Objective to optimize the existing three dimensional image overlap method based on markers, and to propose a more convenient method for overlapping maxillary 3D image. Methods two conical beam CT (CBCT) images were taken from 9 volunteers at intervals of one year. The optimal results of two mathematical methods (6-point optimization method and 8-point optimization method) for establishing the error of common coordinate system of Elsa were compared. The anterior posterior nasal spine point (ANSPNS) was used to establish a common coordinate system (ANSI PNS) for overlapping maxilla. Several markers were selected to detect the overlap error, and statistical analysis was carried out. Results the average line distance and angle error of ELSA coordinate system were (0.60 鹵0.47) mm and (0.49 鹵0.38) 擄, (0.44 鹵0.39) mm and (0.48 鹵0.37) 擄, (0.41 鹵0.34) mm and (0.41 鹵0.32) 擄. The mean line distance and angle error of each marker overlap were (0.95 鹵0.50) mm and (1.06 鹵0.65) 擄, (0.92 鹵0.54) mm and (0.92 鹵0.58) 擄, (0.80 鹵0.43) mm and (0.87 鹵0.59) 擄in the six points optimization method (P0.05) and (0.80 鹵0.43) mm and (0.87 鹵0.59) 擄respectively (all P 0.000 1). The mean line distance and angle error of each marker overlap were (0.95 鹵0.50) mm and (1.06 鹵0.65) 擄, (0.92 鹵0.54) mm and (0.92 鹵0.58) 擄, respectively. After 8 points optimization, the average line distance and angle error of each mark point used to overlap maxilla in ELSAA ANSN PNS coordinate system were (0.92 鹵0.47) mm and (1.14 鹵0.66) 擄, (0.99 鹵0.47) mm and (1.33 鹵0.64) 擄, (1.00 鹵0.62) mm and (1.08 鹵0.70) 擄, respectively. Conclusion the proposed 8-point optimization method can significantly improve the accuracy of the ELSA coordinate system, and the error of the proposed 3D image overlap method of maxilla has basically reached the required scope of clinical case analysis.
【作者單位】： 沈陽(yáng)軍區(qū)總醫(yī)院口腔內(nèi)科;
【基金】：遼寧省自然科學(xué)基金(2015020428)
【分類(lèi)號(hào)】：R816.98

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