Hepatic lesions: discrimination of nonsolid, benign lesions from solid, malignant lesions with heavily T2-weighted fast spin-echo MR imaging.

Abstract

The combined use of moderately and heavily T2-weighted fast spin-echo MR images improves differentiation of small benign hepatic lesions from small malignant lesions.

Hepatic Hemangiomas: Factors Associated with Pseudo Washout Sign on Gd-EOB-DTPA-enhanced MR Imaging

“…[19][20][21][22][23] However, small hemangiomas may not show typical bright signal intensity on T 2 -weighted imaging because of the partial volume phenomenon. 35 We did not compare the signal intensity on T 2 -weighted imaging of small hemangiomas with and without PWS because one criterion for the final diagnosis of hemangioma was the lesion's demonstration of the typical bright signal intensity on T 2 -weighted MR imaging.…”

“…Four hundred and seventy-three of the 509 underwent 3-phase enhanced CT examinations, and from them, we selected the patients with hepatic hemangiomas. Diagnosis was based on their typical manifestation as bright signal intensity on T 2 -weighted MR imaging [19][20][21][22][23] and demonstration of at least 3 of 4 of the following well documented characteristic CT findings: [3][4][5][6][7] hypoattenuation relative to normal liver on precontrast images; nodular or diffuse enhancement during the arterial phase; fill-in enhancement (progressive opacification from the periphery to the center) during the portal venous phase; and prolonged enhancement (iso-or hyperattenuation relative to the liver) during the late phase. According to these criteria, we selected 31 patients for this study (12 men, 19 women; aged 23 to 77 years; mean age, 53.4 years) with 70 hepatic hemangiomas (one in 17 patients, two in 5 patients, three in 4 patients, four in 2 patients, five in one patient, eight in one patient, and 10 in one patient; mean size, 24 mm; size range, 5 to 123 mm according to their largest diameter in the axial plane on T 2 -weighted MR imaging).…”

Processing of radial fast spin‐echo data for obtaining T2 estimates from a single k‐space data set

“…[1], i is the index for the echo number within an echo train, n is the index for the echo train, N is the number of views, and ⌬ ϭ /N. The values of m i depend on ETL.…”

“…Eq. [1] represents a view ordering used in radial fast spin-echo acquisitions to reduce artifacts due to T 2 decay and motion in vivo (16).…”

“…T 2 -weighted imaging is a widespread and valuable method used routinely for the diagnosis of many pathologic disorders (1)(2)(3)(4)(5). Information from T 2 -weighted images in terms of pathology is typically analyzed in a qualitative manner by the radiologist by looking at differences in contrast between tissues in one (or two) T 2 -weighted image(s).…”