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The use of Dixon sequences with AB-MRI allows for both T2- and T1-weighted images with and without fat suppression, which are then used for reading.
Unlike other fat suppression methods, two-point Dixon technique relies on the phase shifts made by fat-water resonance frequency differences to separate water from fat.
Ito, "Comparison of diffusion-weighted images using short inversion time inversion recovery or chemical shift selective pulse as fat suppression in patients with breast cancer," Japanese Journal of Radiology, vol.
The following variables were evaluated [1]: Bowel wall thickness measured in mm, edema (i.e., high signal on T2-weighted imaged with fat suppression), bowel wall enhancement (i.e., higher than the enhancement of normal appearing segment), mesenteric vascularity (comb sign) and edema, the presence of enlarged mesenteric lymph nodes, the presence of ulcer/fistula/fibrosis or abscess, and the length of the visually abnormal appearing segments measured on MRI and PET images.
Caption: Figure 3: Magnetic resonance imaging findings (Tl-weighted fat suppression gadolinium-enhanced image).
According to the relevant literature, the typical imaging manifestations of HAML include the following: fat components, hypervascular nature and the absence of capsule.4,6 Especially the central vessels within the lesions suggested strongly the diagnosis of HAML.6 However, due to the highly variable his- tological composition, the imaging presentation of HAML is highly variable and the differential diag- nosis with other liver tumours, especially malignant tumours, is difficult.6,7 As reported, the adipose frac- tion of HAML varied from 5% to 90%, and fat-defi- cient HAML has been reported with increasing fre- quency in recent years.8 Even compared to CT, MRI can more clearly visualize intra-tumor adipose tis- sue by fat suppression scanning, the preoperative diagnostic accuracy was low.1
Comparison of conventional spin-echo and fast spin-echo magnetic resonance imaging with fat suppression in cruciate ligament injury.
"A high-quality localized image, a negative scan almost entirely excludes a significant bony stress injury.." A fat suppression image also helps in identifying a stress fracture.
Crues et al (9) suggests that "It]he knee must be scanned in the axial, coronal and sagittal planes using thin sections (3 to 5 mm thick) with a combination of T1- and T2-weighted techniques, including at least one T2-weighted image with fat suppression." Likewise, Bontrager (10) discusses the value of some of these sequences.
Coronal T1-weighted images without fat suppression are best for revealing detailed anatomy and evaluating bone marrow and musculature.
The typical magnetic resonance imaging findings of the disease include a hypointense mass on T2-weighted images due to induced fibrosis and hypertrophy of the muscularis mucosa with or without hyperintense hemorrhagic foci on T1-weighted images with fat suppression, abutting the bowel wall (Fig.).
She also underwent axial T1-weighted and T2-weighted imaging without and with fat suppression and black blood technique with cardiac gate.