Liberatory vertigo and nystagmus did not seem to influence the outcome in terms of vertigo and dizziness after the maneuvers. Postmaneuver restrictions did not modify the intensity of vertigo and dizziness during the observation period of one week once after the repositioning maneuver. Conflict of InterestsAuthors do not have any conflict of interests with the financing sources of this study.
T2-weighted cardiac MRI of edema is acquired by combining acceleration techniques with motion suppression and prepulse techniques. These MRI techniques freeze the cardiac and respiratory motion effectively with giving high contrast between the blood, fat, normal myocardium, and myocardial edema. 2.1. Acceleration TechniquesTurbo spin-echo imaging with multiple refocusing pulses has replaced spin-echo imaging in T2-weighted cardiac MRI because the scan time is reduced by a factor of 10�C12 [13].

A parallel imaging technique is also used to reduce the scan time [14, 15].2.2. Motion Suppression TechniquesAn ECG-gating technique is usually used for cardiac MRI. This technique allows for data acquisition at the end diastole when the myocardium is static. A breath-hold technique suppresses respiratory artifacts. Alternative methods to the breath-holding technique are navigator-gating and respiratory-gating techniques [16]. 2.3. Prepulse TechniquesThe black-blood prepulse technique, consisting of two inversion-recovery pulses combined with ECG-gating, is applied to T2-weighted cardiac MRI [17]. By using slice nonselective and selective 180�� pulses, the static tissues experience net zero rotation, whereas the blood signal is nullified at the imaging slice.

The black-blood prepulse technique suppresses the blood signal in the cardiac chamber, thereby improving the visualization of cardiac structures and myocardial edema. Fat-suppression technique using inversion-recovery or spectrally selective pulse highlights myocardial edema by reducing the signal of the adipose tissue close to the myocardium [13].2.4. Quantitative TechniquesMyocardial edema is quantified with T2-weighted MRI with T2-prepared or multiecho acquisition [18]. Zagrosek et al. [19] have reported that the measurement of the signal ratio between the myocardium and skeletal muscle is useful for detection of myocardial edema related to the irreversible myocardial injuries in acute myocarditis.

However, in the current clinical routine, the multicoil and parallel imaging techniques are used, prohibiting the accurate measurement of the signal intensity of the tissues. Therefore, the T2-value measurement is more accurate Dacomitinib and preferable when evaluating the myocardial edema quantitatively. T2 mapping generated from the T2-value measurement of the ventricular myocardium can allow for both visual and quantitative analysis of the myocardial edema (Figure 1).