Diffusion-Weighted Imaging of the Renal and Adrenal Lesions

Kılıçkesmez, Özgür; İnci, Ercan; Atilla, Serhan; Taşdelen, Neslihan; Yetimoglu, Burcu; Yencilek, Faruk; Gurmen, Nevzat

doi:10.1097/rct.0b013e31819f1b83

Cited by 66 publications

(31 citation statements)

References 15 publications

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“…DWI and DTI have been used to examine a variety of intra-abdominal organs, including the liver, kidneys, and pelvic organs (7,8,12,15). With respect to the adrenal gland, only DWI data have been published (5,11,16). To the best of our knowledge, there has been no published study that employed DTI to study the adrenal glands.…”

Section: Discussionmentioning

confidence: 96%

“…When deciding the optimal b value for our study, we reviewed previous studies with b values ranging from 50 to 1000 s/mm 2 . In these studies, the range of observed ADCs was between 0.85 and 2.82×10 -3 (5,11,16). The optimal b value of a given tissue can be determined from the fact that b×ADC is equal to 1.…”

Section: Discussionmentioning

confidence: 99%

“…The previously mentioned studies that performed DWI on the adrenal gland were performed with 1.5 T systems (5,11,16). Systems with higher magnetic fields offer benefits for DWI and DTI imaging.…”

Section: Discussionmentioning

confidence: 99%

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Diffusion tensor imaging in the differentiation of adrenal adenoma and metastases

Işık

Gürses²,

Taşdelen³

et al. 2011

Diagn Interv Radiol

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Section: Discussionmentioning

confidence: 96%

Section: Discussionmentioning

confidence: 99%

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Diffusion tensor imaging in the differentiation of adrenal adenoma and metastases

Işık

Gürses²,

Taşdelen³

et al. 2011

Diagn Interv Radiol

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“…High ADC on the side of the cortex can be explained pathologically by dilation of the collecting ducts and aggregation of cystic structures. On the other hand, the ADC on the side of the papilla was relatively low and rather similar to those of solid masses like renal cell carcinoma or angiomyolipoma, 12 though the imaging parameters and methods used to calculate ADC diŠered somewhat. Thisˆnding may re‰ect clotted blood in cystic structures, or increased cellularity of the interstitium around the cysts.…”

Section: Discussionmentioning

confidence: 99%

MR Imaging of Focal Medullary Sponge Kidney: Case Report

Hida

Nishie

Asayama

et al. 2012

MRMS

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We present a case of focal medullary sponge kidney (MSK) that mimicked a renal tumor. Evaluation of a patient with history of macrohematuria revealed a left renal mass of 3-cm diameter. T 1 -weighted magnetic resonance (MR) images revealed a mass of mixed intensity protruding toward the renal sinus. On fat-saturated T 2 -weighted MR images, the lesion's remarkable hyperintensity suggested the presence of an aggregation of tiny cysts. On diŠusion-weighted MR images, the mass also demonstrated high intensity, and its apparent diŠusion coe‹cient was partly decreased (1.12×10 -3 mm 2 /s). On computed tomography, precontrast images revealed no calciˆcation in the mass. Although slight enhancement was seen in the corticomedullary phase, thick and dense streaks of contrast radiating peripherally were identiˆed in the mass in the excretory phase. Focal MSK was diagnosed. We discuss the potential of MR imaging for diagnosing focal MSK.

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“…In a recent meta-analysis, Li et al [19] has shown a potential future role for this type of sequence to assess for cancers within the liver. Numerous lesions within the genitourinary organs (kidneys, ureters, bladder, adrenal glands, uterus, ovaries, and prostate), as well as the adrenal glands, may also eventually be evaluated for malignant potential using similar techniques [12,[20][21][22][23] . Recently, Padhani et al [24] and Koh et al [25] have alluded to the promising future of DWI as a cancer biomarker in monitoring response to chemotherapeutic agents, in tumor staging, and possibly to aid in antineoplastic clinical drug development.…”

Section: Introductionmentioning

confidence: 99%

Impact of field strength and RF excitation on abdominal diffusion-weighted magnetic resonance imaging

Riffel¹,

Rao²,

Haneder³

et al. 2013

WJR

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AIM:To retrospectively and prospectively compare diffusion-weighted (DW) images in the abdomen in a 1.5T system and 3.0T systems with and without twochannel functionality for B1 shimming.METHODS: DW images of the abdomen were obtained on 1.5T and 3.0T (with and without two-channel functionality for B1 shimming) scanners on 150 patients (retrospective study population) and 10 volunteers (prospective study population). Eight regions were selected for clinical significance or artifact susceptibility (at higher field strengths). Objective grading quantified signal-to-noise ratio (SNR), and subjective evaluation qualified image quality, ghosting artifacts, and diagnostic value. Statistical significance was calculated using χ 2 tests (categorical variables) and independent two-sided t tests or Mann-Whitney U tests (continuous variables). RESULTS:The 3.0T using dual-source parallel transmit (dpTX 3.0T) provided the significantly highest SNRs in nearly all regions. In regions susceptible to artifacts at higher field strengths (left lobe of liver, head of pancreas), the SNR was better or similar to the 1.5T system. Subjectively, both dpTX 3.0T and 1.5T systems provided higher image quality, diagnostic value, and less ghosting artifact (P < 0.01, most values) compared to the 3.0T system without dual-source parallel transmit (non-dpTX 3.0T). CONCLUSION:The dpTX 3.0T scanner provided the highest SNR. Its image quality, lack of ghosting, and diagnostic value were equal to or outperformed most currently used systems. © 2013 Baishideng. All rights reserved.Key words: Abdominal imaging; Diffusion weighted; 3.0T; Radiofrequency excitation; Signal-to-noise ratio Core tip: With the popularity of 3.0T imaging systems, radiologists have commonly found limitations in abdominal imaging with diffusion-weighted imaging (DWI) secondary to B1 in homogeneity artifacts at these higher magnet strengths. Because artifacts disturb diagnostic value of abdominal DWI, 1.5T systems have been mainly used for this particular purpose. However, newer techniques involving 3.0T using dual-source parallel radiofrequency (RF) excitation with parallel transmission and independent RF shimming have recently been developed which may succeed in addressing such limitations. Our study illustrates both the objective and subjective utility in the abdominal distribution while imaging under a 3.0T system which incorporates dualsource RF excitation.

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Diffusion-Weighted Imaging of the Renal and Adrenal Lesions

Abstract: Our findings show that ADC measurement has a potential ability to differentiate benign and malignant focal renal and adrenal lesions with the guidance of conventional sequences. When used alone, diffusion-weighted imaging may lead to misdiagnoses due to overlapping ADCs of the lesions.

Cited by 66 publications

References 15 publications

Diffusion tensor imaging in the differentiation of adrenal adenoma and metastases

Diffusion tensor imaging in the differentiation of adrenal adenoma and metastases

MR Imaging of Focal Medullary Sponge Kidney: Case Report

Impact of field strength and RF excitation on abdominal diffusion-weighted magnetic resonance imaging

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