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Ultrasound Med Biol. 2017 Apr;43(4):775-781. doi: 10.1016/j.ultrasmedbio.2016.12.009. Epub 2017 Feb 7.

2-D and 3-D Ultrasound for Tumor Volume Analysis: A Prospective Study.

Author information

1
Comprehensive Breast Program, H. Lee Moffitt Cancer Center and Research Institute, Tampa, Florida, USA.
2
Diagnostic Breast Imaging, H. Lee Moffitt Cancer Center and Research Institute, Tampa, Florida, USA.
3
Biostatistics and Bioinformatics, H. Lee Moffitt Cancer Center and Research Institute, Tampa, Florida, USA.
4
Comprehensive Breast Program, H. Lee Moffitt Cancer Center and Research Institute, Tampa, Florida, USA. Electronic address: m.catherine.lee@Moffitt.org.

Abstract

Ultrasound (US) allows real-time tumor assessment. We evaluated the volumetric limits of 2-D and 3-D US, compared with magnetic resonance imaging (MRI), with a prospective institutional review board-approved clinical evaluation of US-to-MRI volumetric correlation. US images of pre- and post-neoadjuvant breast cancers were obtained. Volume discrepancy was evaluated with the non-parametric Wilcoxon signed-rank test. Expected inter-observer variability <14% was evaluated as relative paired difference (RPD); clinical relevance was gauged with the volumetric standard error of the mean (SEM). For 42 patients, 133 of 170 US examinations were evaluable. For tumors ≤20 cm3, both highly correlated to MRI with RPD within inter-observer variability and Pearson's correlation up to 0.86 (0.80 before and 0.86 after neoadjuvant chemotherapy, respectively). Lesions 20-40 cm3 had US-to-MRI discrepancy within inter-observer variability for 2-D (RPD: 13%), but not 3-D (RPD: 27%) US (SEM: 1.47 cm3 for 2-D, SEM: 2.28 cm3 for 3-D), suggesting clinical utility. Tumors >40 cm3 correlated poorly. Tumor volumes ≤20 cm3 exhibited a good correlation to MRI. Studies of clinical applications are warranted.

KEYWORDS:

3-Dimensional; Breast cancer; Neoadjuvant treatment; Tumor volume; Ultrasound

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