Virtual colonoscopy in paediatric patients Usefulness of a colon dissection technique.
OBJECTIVE
To determine the usefulness of perspective-filet view for polypoid lesions in paediatric patients in comparison with conventional virtual colonoscopy (VC) analysis and optical colonoscopy.


METHODS
Sixty-one patients (mean age 5 years old) with a previous episode of rectal bleeding were studied using a 16 slices CT scanner. All patients underwent a colonic preparation. Two acquisitions were done in supine and prone positions with slices of 2mm thickness; increment 1mm, 30-50mA; 90-120kV. In a workstation an experienced radiologist reviewed images twice. The first read was done using the conventional virtual colonoscopy technique with the evaluation of two-dimensional (2D), three-dimensional (3D) and endoscopical images. Later, in a second session, perspective-filet view was used. It shows a 360 degrees unrolled visualization of the inner colon. The presence, size and location of the lesions were determined. A record of the reading time was made.


RESULTS
At per patient evaluation the conventional virtual colonoscopy analysis obtained a sensitivity of 86% and a specificity of 98%. The perspective-filet view obtained a sensitivity of 91% and a specificity of 99%. In the evaluation on a per lesion basis the conventional analysis had a sensitivity of 81% and a specificity of 88%. Perspective-filet view, had a sensitivity of 82% and specificity of 90%. The average total reading time using conventional colonoscopy technique was 18+/-3min, versus 4+/-1min using the perspective-filet view.


CONCLUSIONS
Virtual colon dissection with perspective-filet view is more time-efficient than conventional virtual colonoscopy evaluation with correct correlation in results.
Carrascosa
Patricia
P
Diagnóstico Maipú, Av. Maipú 1668, Vicente López (B1602ABQ), Buenos Aires, Argentina. patriciacarrascosa@diagnosticomaipu.com.ar
López
Elba Martín
EM
Capuñay
Carlos
C
Vallejos
Javier
J
Carrascosa
Jorge
J
D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D003111:Colonic Polyps / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000601:surgery; D023881:Colonography, Computed Tomographic; D003113:Colonoscopy; D006801:Humans; D007223:Infant