TY - JOUR
T1 - Reliability and validity of in vitro volume calculations by 3-dimensional ultrasonography using the multiplanar, virtual organ computer-aided analysis (VOCAL), and extended imaging VOCAL methods
AU - De Sá Barreto, Enoch Quinderé
AU - Figuinha Milani, Hérbene José
AU - Araujo, Edward
AU - Krajden Haratz, Karina
AU - Cristine Rolo, Liliam
AU - MacHado Nardozza, Luciano Marcondes
AU - Fernandes Moron, Antonio
PY - 2010/5/1
Y1 - 2010/5/1
N2 - Objective. The purpose of this study was to assess the reliability and validity of in vitro volume calculations by 3-dimensional ultrasonography. Methods. This observational study was performed by 2 examiners to obtain volumes of 3 objects of different shapes and sizes filled with ultrasound gel and immersed in water. The examiners used the multiplanar (5-mm interval), virtual organ computer-aided analysis (VOCAL, 30°) and extended imaging (XI) VOCAL (5, 10, 15, and 20 planes) methods to estimate the volumes of each object. A paired Student t test (P) and intraclass correlation coefficients (ICCs) were used to assess reproducibility of the methods. Validity was assessed comparing the percent differences between the estimated and the real volumes using the P value, mean differences, and ICC for each method. Results. All methods were highly reliable and valid. There were no significant differences in interobserver variability; there was a strong interobserver correlation. There were no significant differences in the percent differences between the estimated and real volumes of the objects using the 3 methods. The XI VOCAL method was superior to the multiplanar and VOCAL methods in the measurement of irregularly shaped objects. The XI VOCAL method with 10 planes estimated volumes closest to the real volumes. Conclusions. All 3 methods were reliable and valid; however, XI VOCAL was superior to the other methods in the measurement of irregularly shaped objects.
AB - Objective. The purpose of this study was to assess the reliability and validity of in vitro volume calculations by 3-dimensional ultrasonography. Methods. This observational study was performed by 2 examiners to obtain volumes of 3 objects of different shapes and sizes filled with ultrasound gel and immersed in water. The examiners used the multiplanar (5-mm interval), virtual organ computer-aided analysis (VOCAL, 30°) and extended imaging (XI) VOCAL (5, 10, 15, and 20 planes) methods to estimate the volumes of each object. A paired Student t test (P) and intraclass correlation coefficients (ICCs) were used to assess reproducibility of the methods. Validity was assessed comparing the percent differences between the estimated and the real volumes using the P value, mean differences, and ICC for each method. Results. All methods were highly reliable and valid. There were no significant differences in interobserver variability; there was a strong interobserver correlation. There were no significant differences in the percent differences between the estimated and real volumes of the objects using the 3 methods. The XI VOCAL method was superior to the multiplanar and VOCAL methods in the measurement of irregularly shaped objects. The XI VOCAL method with 10 planes estimated volumes closest to the real volumes. Conclusions. All 3 methods were reliable and valid; however, XI VOCAL was superior to the other methods in the measurement of irregularly shaped objects.
KW - Extended imaging virtual organ computer-aided analysis
KW - In vitro assessment
KW - Multiplanar
KW - Reliability
KW - Validity
KW - Virtual organ computer-aided analysis
UR - http://www.scopus.com/inward/record.url?scp=77951955407&partnerID=8YFLogxK
U2 - 10.7863/jum.2010.29.5.767
DO - 10.7863/jum.2010.29.5.767
M3 - ???researchoutput.researchoutputtypes.contributiontojournal.article???
C2 - 20427789
AN - SCOPUS:77951955407
SN - 0278-4297
VL - 29
SP - 767
EP - 774
JO - Journal of Ultrasound in Medicine
JF - Journal of Ultrasound in Medicine
IS - 5
ER -