Interobserver agreement on cortical tracer transit in Tc-99m-MAG3 renography applied to congenital hydronephrosis

Ana Isabel Santos, Liliana Violante, Susana Carmona, Ana Prata, Margarida Rodrigues Victor, Joaquim G. Santos, Joaquim Araujo Sequeira, Marta Alves, Ana Luisa Papoila, Amy Piepsz

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

ObjectiveThis study aims to evaluate interobserver agreement on visual analysis of technetium-99m mercaptoacetyltriglycine (Tc-99m-MAG3) renal tissue transit used for the evaluation of antenatal hydronephrosis.Materials and methodsThirty-eight Tc-99m-MAG3 diuretic renograms were retrospectively collected between 1 and 31 December 2015. The 1-min reframed images were presented to four nuclear medicine consultants and to two nuclear medicine residents, one in the first year of the training program and the others in their fourth and final year. These observers were asked to classify the radiotracer cortical transit (normal/delayed) based solely on visual assessment of the images. For the interobserver agreement, modified Fleiss' kappa () analysis for multiple raters was carried out. For both groups, percentages of agreement were also calculated.ResultsA total of 69 kidneys were evaluated. All four nuclear medicine consultants agreed on the classification of 88.4% of the kidneys. When the agreement of at least three of the four observers was considered, the percentage of agreement reached 98.6 The two nuclear medicine residents agreed on the classification of 69.6% of the kidneys. The modified Fleiss' -value was 0.88 (95% confidence interval: 0.79-0.95) for the group of nuclear medicine consultants, indicating almost perfect agreement. For the residents, it was 0.39 (95% confidence interval: 0.16-0.59), suggesting fair agreement.ConclusionOur results seem to indicate that there is an almost perfect agreement in the qualitative identification of delayed cortical transit among physicians with experience at observing renographic images.
Original languageEnglish
Pages (from-to)124-128
Number of pages5
JournalNUCLEAR MEDICINE COMMUNICATIONS
Volume38
Issue number2
DOIs
Publication statusPublished - 1 Feb 2017

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Radioisotope Renography
Hydronephrosis
Nuclear Medicine
Consultants
Kidney
Technetium Tc 99m Mertiatide
Confidence Intervals
Diuretics
Physicians
Education

Keywords

  • congenital
  • hydronephrosis
  • interobserver variability
  • radioactive tracer
  • renography

Cite this

Santos, Ana Isabel ; Violante, Liliana ; Carmona, Susana ; Prata, Ana ; Victor, Margarida Rodrigues ; Santos, Joaquim G. ; Sequeira, Joaquim Araujo ; Alves, Marta ; Papoila, Ana Luisa ; Piepsz, Amy. / Interobserver agreement on cortical tracer transit in Tc-99m-MAG3 renography applied to congenital hydronephrosis. In: NUCLEAR MEDICINE COMMUNICATIONS. 2017 ; Vol. 38, No. 2. pp. 124-128.
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title = "Interobserver agreement on cortical tracer transit in Tc-99m-MAG3 renography applied to congenital hydronephrosis",
abstract = "ObjectiveThis study aims to evaluate interobserver agreement on visual analysis of technetium-99m mercaptoacetyltriglycine (Tc-99m-MAG3) renal tissue transit used for the evaluation of antenatal hydronephrosis.Materials and methodsThirty-eight Tc-99m-MAG3 diuretic renograms were retrospectively collected between 1 and 31 December 2015. The 1-min reframed images were presented to four nuclear medicine consultants and to two nuclear medicine residents, one in the first year of the training program and the others in their fourth and final year. These observers were asked to classify the radiotracer cortical transit (normal/delayed) based solely on visual assessment of the images. For the interobserver agreement, modified Fleiss' kappa () analysis for multiple raters was carried out. For both groups, percentages of agreement were also calculated.ResultsA total of 69 kidneys were evaluated. All four nuclear medicine consultants agreed on the classification of 88.4{\%} of the kidneys. When the agreement of at least three of the four observers was considered, the percentage of agreement reached 98.6 The two nuclear medicine residents agreed on the classification of 69.6{\%} of the kidneys. The modified Fleiss' -value was 0.88 (95{\%} confidence interval: 0.79-0.95) for the group of nuclear medicine consultants, indicating almost perfect agreement. For the residents, it was 0.39 (95{\%} confidence interval: 0.16-0.59), suggesting fair agreement.ConclusionOur results seem to indicate that there is an almost perfect agreement in the qualitative identification of delayed cortical transit among physicians with experience at observing renographic images.",
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author = "Santos, {Ana Isabel} and Liliana Violante and Susana Carmona and Ana Prata and Victor, {Margarida Rodrigues} and Santos, {Joaquim G.} and Sequeira, {Joaquim Araujo} and Marta Alves and Papoila, {Ana Luisa} and Amy Piepsz",
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Interobserver agreement on cortical tracer transit in Tc-99m-MAG3 renography applied to congenital hydronephrosis. / Santos, Ana Isabel; Violante, Liliana; Carmona, Susana; Prata, Ana; Victor, Margarida Rodrigues; Santos, Joaquim G.; Sequeira, Joaquim Araujo; Alves, Marta; Papoila, Ana Luisa; Piepsz, Amy.

In: NUCLEAR MEDICINE COMMUNICATIONS, Vol. 38, No. 2, 01.02.2017, p. 124-128.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Interobserver agreement on cortical tracer transit in Tc-99m-MAG3 renography applied to congenital hydronephrosis

AU - Santos, Ana Isabel

AU - Violante, Liliana

AU - Carmona, Susana

AU - Prata, Ana

AU - Victor, Margarida Rodrigues

AU - Santos, Joaquim G.

AU - Sequeira, Joaquim Araujo

AU - Alves, Marta

AU - Papoila, Ana Luisa

AU - Piepsz, Amy

PY - 2017/2/1

Y1 - 2017/2/1

N2 - ObjectiveThis study aims to evaluate interobserver agreement on visual analysis of technetium-99m mercaptoacetyltriglycine (Tc-99m-MAG3) renal tissue transit used for the evaluation of antenatal hydronephrosis.Materials and methodsThirty-eight Tc-99m-MAG3 diuretic renograms were retrospectively collected between 1 and 31 December 2015. The 1-min reframed images were presented to four nuclear medicine consultants and to two nuclear medicine residents, one in the first year of the training program and the others in their fourth and final year. These observers were asked to classify the radiotracer cortical transit (normal/delayed) based solely on visual assessment of the images. For the interobserver agreement, modified Fleiss' kappa () analysis for multiple raters was carried out. For both groups, percentages of agreement were also calculated.ResultsA total of 69 kidneys were evaluated. All four nuclear medicine consultants agreed on the classification of 88.4% of the kidneys. When the agreement of at least three of the four observers was considered, the percentage of agreement reached 98.6 The two nuclear medicine residents agreed on the classification of 69.6% of the kidneys. The modified Fleiss' -value was 0.88 (95% confidence interval: 0.79-0.95) for the group of nuclear medicine consultants, indicating almost perfect agreement. For the residents, it was 0.39 (95% confidence interval: 0.16-0.59), suggesting fair agreement.ConclusionOur results seem to indicate that there is an almost perfect agreement in the qualitative identification of delayed cortical transit among physicians with experience at observing renographic images.

AB - ObjectiveThis study aims to evaluate interobserver agreement on visual analysis of technetium-99m mercaptoacetyltriglycine (Tc-99m-MAG3) renal tissue transit used for the evaluation of antenatal hydronephrosis.Materials and methodsThirty-eight Tc-99m-MAG3 diuretic renograms were retrospectively collected between 1 and 31 December 2015. The 1-min reframed images were presented to four nuclear medicine consultants and to two nuclear medicine residents, one in the first year of the training program and the others in their fourth and final year. These observers were asked to classify the radiotracer cortical transit (normal/delayed) based solely on visual assessment of the images. For the interobserver agreement, modified Fleiss' kappa () analysis for multiple raters was carried out. For both groups, percentages of agreement were also calculated.ResultsA total of 69 kidneys were evaluated. All four nuclear medicine consultants agreed on the classification of 88.4% of the kidneys. When the agreement of at least three of the four observers was considered, the percentage of agreement reached 98.6 The two nuclear medicine residents agreed on the classification of 69.6% of the kidneys. The modified Fleiss' -value was 0.88 (95% confidence interval: 0.79-0.95) for the group of nuclear medicine consultants, indicating almost perfect agreement. For the residents, it was 0.39 (95% confidence interval: 0.16-0.59), suggesting fair agreement.ConclusionOur results seem to indicate that there is an almost perfect agreement in the qualitative identification of delayed cortical transit among physicians with experience at observing renographic images.

KW - congenital

KW - hydronephrosis

KW - interobserver variability

KW - radioactive tracer

KW - renography

U2 - 10.1097/MNM.0000000000000620

DO - 10.1097/MNM.0000000000000620

M3 - Article

VL - 38

SP - 124

EP - 128

JO - NUCLEAR MEDICINE COMMUNICATIONS

JF - NUCLEAR MEDICINE COMMUNICATIONS

SN - 0143-3636

IS - 2

ER -