title: Computerized videodefecography versus defecography: do we need radiographs?
abstract: OBJECTIVE
  Defecography has been recognized as a valuable method for evaluating patients with evacuation disorders. It consists of the use of static radiography and fluoroscopy to record different situations within anorectal dynamics. Conventionally, rectal parameters are measured using radiograms. It is rare for fluoroscopy alone to be used. Computer software has been developed with the specific aim of calculating these measurements from digitized videotaped images obtained during fluoroscopy, without the need for radiographic film, thereby developing a computerized videodefecography method. The objective was thus to compare measurements obtained via computerized videodefecography with conventional measurements and to discuss the advantages of the new method.
  
  
  METHODS
  Prospective study at the radiology service of Hospital das Clínicas, Universidade de São Paulo.
  
  
  METHODS
  Ten consecutive normal subjects underwent videodefecography. The anorectal angle, anorectal junction, puborectalis muscle length, anal canal length and degree of anal relaxation were obtained via the conventional method (using radiography film) and via computerized videodefecography using the ANGDIST software. Measurement and analysis of these parameters was performed by two independent physicians.
  
  
  RESULTS
  Statistical analysis confirmed that the measurements obtained through direct radiography film assessment and using digital image analysis (computerized videodefecography) were equivalent.
  
  
  CONCLUSIONS
  Computerized videodefecography is equivalent to the traditional defecography examination. It has the advantage of offering reduced radiation exposure through saving on the use of radiography.
authors: Faculdade de Medicina, Universidade de São Paulo, São Paulo, Brazil. sobrado@iconet.com.br
authors: Carlos Walter
authors: CW
authors: Sobrado
authors: Carlos Eduardo Fonseca
authors: CE
authors: Pires
authors: Sergio Eduardo Alonso
authors: SE
authors: Araújo
authors: Edson
authors: E
authors: Amaro
authors: Angelita
authors: A
authors: Habr-Gama
authors: Desidério Roberto
authors: DR
authors: Kiss
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D019841:Defecography / Q000379:methods*; D005260:Female; D005471:Fluoroscopy / Q000379:methods*; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008297:Male; D008875:Middle Aged; D015588:Observer Variation; D011446:Prospective Studies; D012007:Rectum / Q000033:anatomy & histology / Q000000981:diagnostic imaging*; D014743:Videotape Recording