CPMG echo amplitudes with arbitrary refocusing angle: Explicit expressions, asymptotic behavior, approximations

► CPMG pulse sequence with arbitrary refocusing angles and resonance offset. ► Exact analytical expression for echo amplitudes was obtained. ► Asymptotic behavior of echoes was determined. ► Analytical approximation for echoes was derived. ► Asymptotic form and approximation were compared with exact echoes.