Paper Information

Journal:   IRANIAN JOURNAL OF RADIOLOGY   OCTOBER 2016 , Volume 13 , Number 4; Page(s) 0 To 0.
 
Paper: 

COMPUTED TOMOGRAPHY COLONOGRAPHY PHANTOM: CONSTRUCTION, VALIDATION AND LITERATURE REVIEW

 
Author(s):  LAMBERT LUKAS*, LAMBERTOVA ALENA, DANES JAN, GRUSOVA GABRIELA
 
* DEPARTMENT OF RADIOLOGY, GENERAL UNIVERSITY HOSPITAL IN PRAGUE, U NEMOCNICE 2, 128 08 PRAGUE 2, CZECH REPUBLIC
 
Abstract: 

Background: Several dedicated computed tomography (CT) colonography phantoms have been described previously.
Objectives: To compare their pros and cons and describe the construction of a dedicated phantom that can be easily manufactured.
Materials and Methods: We found 15 different phantom designs by literature search and compared their advantages and disadvantages based on their description and images. We tested various materials for density and mechanical properties and constructed a phantom from polypropylene pipes (30mmand 50mmin diameter, 52 cm in length). Haustral folds were created by heat shaping and 39 intermediate sessile polyps with a target size of 6-10mmand two flat lesions were created from silicone. Nine polyps were attached to a fold. The model was placed in a 30-cm barrel filled with water to simulate attenuation of human body. Attenuation of polyps was compared to intermediate polyps found in patients.
Results: None of the earlier colonic phantoms found in the literature incorporated all the properties that would ensure both reproducibility and validity of the model (including a rigid wall, density of the wall and polyps similar to human colon, at least two levels of distension and durability). In the present phantom, the average size of sessile polyps was 8.6
± 0.9 mm and their density was 53±24 HU. We found no significant difference in polyp density between simulated polyps in the phantom and polyps in human subjects (P=0.70). All polyps, with the exception of one flat lesion, were detected by computer aided detection.
Conclusion: We constructed and validated a CT colonography phantom with correct density allowing performance of reproducible experiments.

 
Keyword(s): PHANTOM, CT COLONOGRAPHY, POLYP, REVIEW, LOW-DOSE
 
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