Effect of bit depth and kVp of digital radiography for detection of subtle differences

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• 作者：Min-Suk Heo ; Da-Hye Choi ; Erika Benavides ; Kyung-Hoe Huh ; Won-Jin Yi ; Sam-Sun Lee ; Soon-Chul Choi
• 刊名：Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontology
• 出版年：2009
• 出版时间：August 2009
• 年：2009
• 卷：108
• 期：2
• 页码：278-283
• 全文大小：504 K

文摘

Objectives

The purpose of this study is to investigate the effects of different bit depths and kilovoltage peak (kVp) values used in intraoral digital radiography on observer performance in detecting subtle radiographic density differences.

Study design

Using an intraoral CCD sensor set at 8- or 12-bit depth, kVp set at 60 or 70, and 14 different exposure times, digital radiographs were acquired of a specially designed aluminum step-wedge phantom with small holes of different depths in each step. Ten observers examined all images.

Results

The observers counted more holes with the 12-bit images compared with the 8-bit images, particularly at 60 kVp. Significantly more holes were also counted with images taken at 70 kVp compared with those taken at 60 kVp.

Conclusion

Regarding the detection of subtle radiographic density differences, 12-bit images and 70 kVp were superior to 8-bit images and 60 kVp.