Combined signal averaging and compressed sensing: impact on quality of contrast-enhanced fat-suppressed 3D turbo field-e
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HEAD-NECK-ENT RADIOLOGY
Combined signal averaging and compressed sensing: impact on quality of contrast-enhanced fat-suppressed 3D turbo field-echo imaging for pharyngolaryngeal squamous cell carcinoma Koji Takumi 1
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& Hiroaki Nagano & Ryota Nakanosono & Yuichi Kumagae & Yoshihiko Fukukura & Takashi Yoshiura
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Received: 19 April 2020 / Accepted: 11 June 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Purpose To determine whether combined signal averaging and compressed sensing (CS averaging) improves the image quality of contrast-enhanced fat-suppressed T1-weighted three-dimensional turbo field-echo (FS T1W 3D-TFE) for evaluation of pharyngolaryngeal squamous cell carcinoma (PLSCC). Methods This retrospective study included 27 patients with PLSCC. In all patients, contrast-enhanced FS T1W 3D-TFE imaging with CS averaging (number of excitations, 7) and that without CS averaging (number of excitations, 1) were obtained during the same acquisition time. Overall image quality, mucosal enhancement, vessel clarity, motion artifact, lesion conspicuity, and lesion edge sharpness were qualitatively evaluated using a 5-point scale. Images with and without CS averaging were compared using the Wilcoxon signed-rank test. Signal-to-noise ratio (SNR) of the lesion and the muscle structure were compared between the two imaging methods using a paired t-test. Results Compared with the images without CS averaging, those with CS averaging showed significantly better overall image quality (p = 0.002), mucosal enhancement (p = 0.009), vessel clarity (p = 0.003), muscle edge clarity (p = 0.002), lesion conspicuity (p = 0.002), and lesion edge sharpness (p = 0.001); and less motion artifact (p < 0.001). The SNRs of the lesion and of the muscle structure were significantly higher for images with CS averaging than those without CS averaging (p < 0.001). Conclusion CS averaging improves the image quality of contrast-enhanced FS T1W 3D-TFE MR images for evaluation of PLSCC without requiring additional acquisition time. Keywords Compressed sensing . Averaging . Head and neck . Magnetic resonance imaging
Introduction MR imaging plays an important role in the pretreatment evaluation of head and neck malignancies. High-resolution contrast-enhanced three-dimensional (3D) T1-weighted MR imaging techniques and multiplanar reconstruction delineate anatomical details in the head and neck [1–3]. They enable accurate evaluation of the anatomical extent and nodal metastases of the lesions, which is critical for assessment of cancer staging and surgical planning [4–6]. In clinical practice,
* Koji Takumi [email protected] 1
Department of Radiology, Kagoshima University Graduate School of Medical and Dental Sciences, 8-35-1 Sakuragaoka, Kagoshima City 890-8544, Japan
however, the difficulty of elderly and debilitated patients to suppress coughing or swallowing during the examination commonly renders the MR images non-diagnostic. Previous reports [7, 8] have shown that the imaging quality of 8–15
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