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Automatic Detection of Calcaneal-Fifth Metatarsal Angle Using Radiograph: A Computer-Aided Diagnosis of Flat Foot for Military New Recruits in Taiwan.

Yang CH, Chou KT, Chung MB, Chuang KS, Huang TC - PLoS ONE (2015)

Bottom Line: The result of this computer-calculated arch angle was compared with manual measurement results from two radiologists, which showed that our automatic arch angle measurement method had a high consistency.In addition, this method had a high accuracy of 97% and 96% as compared with the measurements of radiologists A and B, respectively.The findings indicated that our MI registration measurement method cannot only accurately measure the CA-MT5 angle, but also saves time and reduces human error.

View Article: PubMed Central - PubMed

Affiliation: Department of Radiology, Tao Yuan General Hospital, Ministry of Health and Welfare, Taoyuan City, Taiwan; Department of Biomedical Engineering and Environment Science, National Tsing Hua University, Hsinchu City, Taiwan.

ABSTRACT
Flatfoot (pes planus) is one of the most important physical examination items for military new recruits in Taiwan. Currently, the diagnosis of flatfoot is mainly based on radiographic examination of the calcaneal-fifth metatarsal (CA-MT5) angle, also known as the arch angle. However, manual measurement of the arch angle is time-consuming and often inconsistent between different examiners. In this study, seventy male military new recruits were studied. Lateral radiographic images of their right and left feet were obtained, and mutual information (MI) registration was used to automatically calculate the arch angle. Images of two critical bones, the calcaneus and the fifth metatarsal bone, were isolated from the lateral radiographs to form reference images, and were then compared with template images to calculate the arch angle. The result of this computer-calculated arch angle was compared with manual measurement results from two radiologists, which showed that our automatic arch angle measurement method had a high consistency. In addition, this method had a high accuracy of 97% and 96% as compared with the measurements of radiologists A and B, respectively. The findings indicated that our MI registration measurement method cannot only accurately measure the CA-MT5 angle, but also saves time and reduces human error. This method can increase the consistency of arch angle measurement and has potential clinical application for the diagnosis of flatfoot.

No MeSH data available.


Related in: MedlinePlus

Bland–Altman plot (B-A plot) used to assess the agreement between two measurement methods.(A) Radiologist A vs. MI. (B) Radiologist B vs. MI. The X-axis is the average of the measurements, and the y-axis is the difference between the two methods.
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pone.0131387.g007: Bland–Altman plot (B-A plot) used to assess the agreement between two measurement methods.(A) Radiologist A vs. MI. (B) Radiologist B vs. MI. The X-axis is the average of the measurements, and the y-axis is the difference between the two methods.

Mentions: Using a Bland–Altman plot (B-A plot) to analyze the agreement between two different measurement techniques, it was found that the mean and the 95% limits of MI registration compared to the results of radiologists A and B were -1.27, 4.14 ~ -6.70 (MI vs Dr. A, Fig 7A) and -1.77, 4.40 ~ -7.94 (MI vs Dr. B, Fig 7B), respectively. The results indicated differences within the mean ± 1.96 SD, and therefore the MI registration method was not clinically different from the results of either radiologist.


Automatic Detection of Calcaneal-Fifth Metatarsal Angle Using Radiograph: A Computer-Aided Diagnosis of Flat Foot for Military New Recruits in Taiwan.

Yang CH, Chou KT, Chung MB, Chuang KS, Huang TC - PLoS ONE (2015)

Bland–Altman plot (B-A plot) used to assess the agreement between two measurement methods.(A) Radiologist A vs. MI. (B) Radiologist B vs. MI. The X-axis is the average of the measurements, and the y-axis is the difference between the two methods.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4488398&req=5

pone.0131387.g007: Bland–Altman plot (B-A plot) used to assess the agreement between two measurement methods.(A) Radiologist A vs. MI. (B) Radiologist B vs. MI. The X-axis is the average of the measurements, and the y-axis is the difference between the two methods.
Mentions: Using a Bland–Altman plot (B-A plot) to analyze the agreement between two different measurement techniques, it was found that the mean and the 95% limits of MI registration compared to the results of radiologists A and B were -1.27, 4.14 ~ -6.70 (MI vs Dr. A, Fig 7A) and -1.77, 4.40 ~ -7.94 (MI vs Dr. B, Fig 7B), respectively. The results indicated differences within the mean ± 1.96 SD, and therefore the MI registration method was not clinically different from the results of either radiologist.

Bottom Line: The result of this computer-calculated arch angle was compared with manual measurement results from two radiologists, which showed that our automatic arch angle measurement method had a high consistency.In addition, this method had a high accuracy of 97% and 96% as compared with the measurements of radiologists A and B, respectively.The findings indicated that our MI registration measurement method cannot only accurately measure the CA-MT5 angle, but also saves time and reduces human error.

View Article: PubMed Central - PubMed

Affiliation: Department of Radiology, Tao Yuan General Hospital, Ministry of Health and Welfare, Taoyuan City, Taiwan; Department of Biomedical Engineering and Environment Science, National Tsing Hua University, Hsinchu City, Taiwan.

ABSTRACT
Flatfoot (pes planus) is one of the most important physical examination items for military new recruits in Taiwan. Currently, the diagnosis of flatfoot is mainly based on radiographic examination of the calcaneal-fifth metatarsal (CA-MT5) angle, also known as the arch angle. However, manual measurement of the arch angle is time-consuming and often inconsistent between different examiners. In this study, seventy male military new recruits were studied. Lateral radiographic images of their right and left feet were obtained, and mutual information (MI) registration was used to automatically calculate the arch angle. Images of two critical bones, the calcaneus and the fifth metatarsal bone, were isolated from the lateral radiographs to form reference images, and were then compared with template images to calculate the arch angle. The result of this computer-calculated arch angle was compared with manual measurement results from two radiologists, which showed that our automatic arch angle measurement method had a high consistency. In addition, this method had a high accuracy of 97% and 96% as compared with the measurements of radiologists A and B, respectively. The findings indicated that our MI registration measurement method cannot only accurately measure the CA-MT5 angle, but also saves time and reduces human error. This method can increase the consistency of arch angle measurement and has potential clinical application for the diagnosis of flatfoot.

No MeSH data available.


Related in: MedlinePlus