Abstract
This Editorial Comment refers to the articles “Contrast-enhanced cone-beam breast-CT (CBBCT): clinical performance compared to mammography and MRI” by Wienbeck S et al, Eur Radiol. 2018 Mar 28. doi: 10.1007/s00330-018-5376-4 and “Diagnosis of breast cancer based on microcalcifications using grating-based phase contrast CT” by Li X et al, Eur Radiol. 2018 Jan 26. doi: 10.1007/s00330-017-5158-4
With an incidence of 12.3%, breast cancer constitutes the most frequent cancer in the normal female population [1]. In Europe, 216,000 cases of breast cancer are newly diagnosed each year, with breast cancer being the second most common cause of death by cancer [2]. The most important breast imaging technique is mammography, which has been shown to reduce relative mortality in the order of 30–35%. However, conventional mammography is hampered by several short-comings: (i) the relatively low sensitivity in patients with dense breast tissue, and (ii) the relatively low positive predictive value of microcalcifications resulting in a vast number of unnecessary biopsies.
A promising new technique is cone-beam computer-tomography of the breast (CBBCT) offering truly isotropic 3D images of the breast at high spatial resolution, which overcomes the short-coming of conventional mammography with the potential superimposition of breast cancer by dense breast tissue. Recently, Wienbeck et al [3] applied a CBBCT in a prospective study in 41 patients assessing 100 BIRADS 4 and 5 lesions. All included patients exhibited dense breast tissue (ACR type c or d). The authors compared contrast-enhanced CBBCT after the injection of iodinated contrast-agent (CE-CBBCT) with non-enhanced CBBCT (NC-CBBCT), conventional mammography and breast-MRI. The authors found a significantly higher diagnostic accuracy of CE-CBBCT compared to NC-CBBCT and conventional mammography almost reaching the accuracy of breast-MRI. Sensitivity of CE-CBBCT was 37–39% higher compared to conventional mammography. A limitation of the presented study is the lack of a comparison with digital breast tomosynthesis, which is a pseudo-3D technique reducing the overlap with dense breast tissue. Another limitation of the current CE-CBBCT imaging technique is the fact that only one breast may be imaged at once, which is not an issue in breast-MRI. As the device can only depict one breast within one scan, and contrast-agent can only be administered once during an examination, only one side can be depicted during one session, and examination of both breasts requires a second appointment.
Regarding the relatively low specificity of microcalcifications for prediction of breast cancer, one new promising technique is the phase-contrast measurement in X-ray breast examinations. In a study by Wang et al [4], the application of phase-contrast X-ray mammography for the classification of microcalcifications was proposed. In phase-contrast the complementary nature of absorption and small-angle scattering signals are used to obtain a more comprehensive characterization of microcalcifications. Technically, an X-ray grating interferometer is applied on a conventional X-ray tube. In a recent study by Li et al [5], a CT-based method was applied for phase-contrast imaging of microcalcifications. In a Talbot-Lau interferometer setup, 21 specimens from 20 patients were examined, with 11 specimens from benign breast diseases and 10 specimens from invasive-ductal carcinoma or ductal carcinoma in situ. Li et al report a significantly higher accuracy of phase-contrast imaging for the classification microcalcifications compared to projection images.
Altogether, there are several interesting new techniques on the horizon, which will provide a notable improvement of sensitivity and specificity in breast imaging using X-ray techniques, thereby allowing for significantly shorter examination times as compared to the current gold standard of breast MRI. CBBCT is already a commercially available technique, whereas phase-contrast mammography is still at the stage of development.
References
Advani P, Moreno-Aspitia A (2014) Current strategies for the prevention of breast cancer. Breast Cancer (Dove Med Press) 6:59–71
Kamangar F, Dores GM, Anderson WF (2006) Patterns of cancer incidence, mortality, and prevalence across five continents: defining priorities to reduce cancer disparities in different geographic regions of the world. J Clin Oncol. 24(14):2137–2150
Wienbeck S, Uhlig J, Luftner-Nagel S et al (2017) The role of cone-beam breast-CT for breast cancer detection relative to breast density. Eur Radiol 27(12):5185–5195
Wang Z, Hauser N, Singer G et al (2014) Non-invasive classification of microcalcifications with phase-contrast X-ray mammography. Nat Commun 5:3797
Li X, Gao H, Chen Z et al (2018) Diagnosis of breast cancer based on microcalcifications using grating-based phase contrast CT. Eur Radiol. https://doi.org/10.1007/s00330-017-5158-4
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This comment refers to the articles available at https://doi.org/10.1007/s00330-017-5158-4 and https://doi.org/10.1007/s00330-018-5376-4
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Boss, A. Editorial comment: cone-beam and phase contrast CT: new horizons in breast imaging?. Eur Radiol 28, 3729–3730 (2018). https://doi.org/10.1007/s00330-018-5456-5
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DOI: https://doi.org/10.1007/s00330-018-5456-5