Figure 4.

¹H MR image (A) and corresponding ¹H NMR spectrum of a sample comprising a 10-mm NMR tube with propylene placed inside a 15-mm tube with propane (B). ¹H MR image (C) and corresponding ¹H NMR spectrum (D) of the same phantom with application of selective suppression pulse for propane NMR signals. The FOV for both images was 5 × 5 cm with 128 × 128 matrix size and 10-mm slice thickness along the z axis; the total acquisition time was ∼8 seconds. The ¹H NMR spectrum was obtained using the same ultrashort echo time (UTE) pulse sequence as that for ¹H MRI but with the gradients switched off and the spectral bandwidth appropriately reduced.