Change of Radiologic Index of Foot according to Radiation Projection Angle: A Study Using Phantom Foot.
10.14193/jkfas.2015.19.4.165
- Author:
Eo Jin KIM
1
;
Sang Gyo SEO
;
Dong Yeon LEE
Author Information
1. Department of Orthopedic Surgery, Seoul National University Hospital, Seoul, Korea. leedy@snu.ac.kr
- Publication Type:Original Article
- Keywords:
Radiography;
Radiographic phantom;
Radiation projection;
Radiographic parameters;
Measurement
- MeSH:
Foot*;
Metatarsal Bones;
Phantoms, Imaging;
Radiography
- From:Journal of Korean Foot and Ankle Society
2015;19(4):165-170
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
PURPOSE: The purpose of this study is to analyze the measurement differences of simple radiographs according to radiation projection angle using a phantom and to propose methods for objective analysis of simple radiographs. MATERIALS AND METHODS: We took simple radiographs with different projection angles using a C-arm image intensifier and measured five parameters of the foot on the simple radiographic images. Five parameters include lateral tibiocalcaneal angle, lateral talocalcaneal angle, naviculocuboid overlap, lateral talo-first metatarsal angle, and lateral calcaneo-first metatarsal angle. Intraobserver and interobserver reliability were verified, and then intraclass correlations of parameters were analyzed. RESULTS: Radiographic parameters of the foot showed high intraobserver and interobserver reliability. Lateral tibiocalcaneal angle has a strong negative linear relationship with rotation and a moderate negative linear relationship with tilt. Lateral talocalcaneal angle has a moderate positive linear relationship with rotation and a strong positive linear relationship with tilt. Naviculocuboid overlap has a strong positive linear relationship with rotation and a moderate positive linear relationship with tilt. Lateral talo-first metatarsal angle does not have a linear relationship with rotation and a moderate negative linear relationship with tilt. Lateral calcaneo-first metatarsal angle has a moderate positive linear relationship with rotation and tilt. CONCLUSION: More precise evaluation of the foot with a simple radiograph can be performed by understanding the changes of radiographic parameters according to radiation projection angle.
