Pulmonary MRI: Applications and Use Cases

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INVITED COMMENTARY

Pulmonary MRI: Applications and Use Cases Raza Mushtaq 1

&

Usha Jayagurunathan 1 & Hina Arif-Tiwari 1 & Kavitha Yaddanapudi 1

Accepted: 5 October 2020 # Springer Science+Business Media, LLC, part of Springer Nature 2020

Abstract Purpose of Review Magnetic resonance imaging (MRI) has robust soft tissue characterization capability which was previously limited to evaluation of the mediastinum, cardiac, and chest wall imaging. MRI has now progressed from an experimental tool to complementary and alternate radiation free imaging modality for optimal identification and comprehensive evaluation of the lung parenchyma including structural, functional, and real-time imaging covering lung nodules/masses, infections, interstitial lung disease, airway diseases, and vascular and pleural abnormalities. Recent Findings Recent use of fast imaging techniques and respiratory gating has overcome several of the previously reported MRI technical difficulties such as respiratory, cardiac and diaphragmatic motion, as well as susceptibility related to air tissue interface in the lungs. Summary MRI is a viable tool to the imaging armamentarium for the identification and characterization of pulmonary parenchymal abnormalities, providing complementary diagnostic information to computed tomography (CT), improving the noninvasive diagnostic accuracy and problem-solving for indeterminate lesions. Keywords Pulmonary MRI . Lung MRI . Pulmonary nodule . Diffusion pulmonary MRI

Introduction Computed tomography (CT) is the workhorse of thoracic imaging and extensively used for pulmonary parenchymal, airway, and vascular disease. However, the major drawback is radiation and lack of soft tissue characterization even at times with contrast on board [1–4]. This is further exacerbated by the different practices among medical centers, particularly in terms for overscanning in chest CT, which can result in increased effective and organ radiation dose [5]. Historically, pulmonary magnetic resonance imaging (MRI) has been sparsely utilized with limited role of pulmonary parenchyma due to numerous technical difficulties in the early developments [6, 7]. Tremendous improvements in MRI techniques including parallel imaging, ultrafast sequences, and respiratory and cardiac gating have made possible the routine use of MRI in clinical practice for the evaluation of pulmonary parenchymal This article is part of the Topical Collection on Pulmonary Radiology * Raza Mushtaq [email protected] 1

Department of Medical Imaging, University of Arizona College of Medicine, 1501 N Campbell Ave, Tucson, AZ 85724, USA

abnormalities. In addition to being a viable alternative to ionizing imaging modality, MRI has several advantages such as its ability to provide structural and functional information due to inherent and exquisite soft tissue resolution. MRI can aid in tissue characterization as a non-invasive alternative to biopsy to help guide medical management [8, 9]. In this paper, we will discuss applications and use of MRI in pulmonary