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01.01.2018 | ONCOLOGY IMAGING

Heterogeneity analysis of diffusion-weighted MRI for prediction and assessment of microstructural changes early after one cycle of induction chemotherapy in nasopharyngeal cancer patients

verfasst von: Manijeh Beigi, Anahita Fathi Kazerooni, Mojtaba Safari, Marzieh Alamolhoda, Mohsen Shojaee Moghdam, Shiva Moghadam, Hamidreza SalighehRad, Ahmad Ameri

Erschienen in: La radiologia medica | Ausgabe 1/2018

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Abstract

Purpose

To evaluate whether the pretreatment apparent diffusion coefficient (ADC) heterogeneity parameters and their alterations, after one cycle of induction chemotherapy, can be used as reliable markers of treatment response to induction chemotherapy in patients with nasopharyngeal cancer.

Materials and methods

Ten patients were recruited and received induction chemotherapy (IC). Diffusion-weighted imaging was performed prior to, during, and after IC. The first-order ADC histogram parameters at the intra-treatment time-point were compared to the baseline time-point in the metastatic lymph nodes (LNs). Some ADC pretreatment parameters were combined with each other, employing discriminant analysis to achieve a feasible model to separate the complete response (CR) from the partial response (PR) groups.

Results

For ten patients, significant rise in Mean and Txt₁Mean (p = 0.048 and 0.015, respectively) was observed in the metastatic nodes following one cycle of IC. Txt₅Energy significantly decreased (p = 0.002). Discriminant analysis on pretreatment parameters illustrated that Txt₅Energy_pre was the best parameter to use to correctly classify CR and PR patients. This was followed by Txt₉Percentile75_pre, Txt₁Mean_pre, and Txt₂Standard Deviation_pre.

Conclusions

Our results suggest that heterogeneity metrics extracted from ADC-maps in metastatic lymph nodes, before and after IC, can be used as supplementary IC response indicators.

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Titel: Heterogeneity analysis of diffusion-weighted MRI for prediction and assessment of microstructural changes early after one cycle of induction chemotherapy in nasopharyngeal cancer patients
verfasst von: Manijeh Beigi
Anahita Fathi Kazerooni
Mojtaba Safari
Marzieh Alamolhoda
Mohsen Shojaee Moghdam
Shiva Moghadam
Hamidreza SalighehRad
Ahmad Ameri
Publikationsdatum: 01.01.2018
Verlag: Springer Milan
Erschienen in: La radiologia medica / Ausgabe 1/2018
Print ISSN: 0033-8362
Elektronische ISSN: 1826-6983
DOI: https://doi.org/10.1007/s11547-017-0808-9

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Heterogeneity analysis of diffusion-weighted MRI for prediction and assessment of microstructural changes early after one cycle of induction chemotherapy in nasopharyngeal cancer patients