Free-breathing radial stack-of-stars three-dimensional Dixon gradient echo sequence in abdominal magnetic resonance imaging in sedated pediatric patients

Duffy, Patrick; Stemmer, Alto; Callahan, Michael J.; Cravero, Joseph P.; Johnston, Patrick; Warfield, Simon K.; Bixby, Sarah D.

doi:10.1007/s00247-021-05054-3

Cited by 8 publications

(8 citation statements)

References 32 publications

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“…The pulse sequence should likely use a form of centric reordering, while at the same providing a sufficient level of incoherence between the sample order of partitions and the respiratory cycle. Alternatively, traditional excitation followed by Dixon‐based water and fat reconstruction may be considered, 20,38,39 at the cost of increased

{T}_{\mathrm{R}}

and reconstruction complexity.…”

Section: Discussionmentioning

confidence: 99%

Single‐spoke binning: Reducing motion artifacts in abdominal radial stack‐of‐stars imaging

Maatman

Ypma

Kachelrieß

et al. 2023

Magnetic Resonance in Med

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Purpose To increase the effectiveness of respiratory gating in radial stack‐of‐stars MRI, particularly when imaging at high spatial resolutions or with multiple echoes. Methods Free induction decay (FID) navigators were integrated into a three‐dimensional gradient echo radial stack‐of‐stars pulse sequence. These navigators provided a motion signal with a high temporal resolution, which allowed single‐spoke binning (SSB): each spoke at each phase encode step was sorted individually to the corresponding motion state of the respiratory signal. SSB was compared with spoke‐angle binning (SAB), in which all phase encode steps of one projection angle were sorted without the use of additional navigator data. To illustrate the benefit of SSB over SAB, images of a motion phantom and of six free‐breathing volunteers were reconstructed after motion‐gating using either method. Image sharpness was quantitatively compared using image gradient entropies. Results The proposed method resulted in sharper images of the motion phantom and free‐breathing volunteers. Differences in gradient entropy were statistically significant (p = 0.03) in favor of SSB. The increased accuracy of motion‐gating led to a decrease of streaking artifacts in motion‐gated four‐dimensional reconstructions. To consistently estimate respiratory signals from the FID‐navigator data, specific types of gradient spoiler waveforms were required. Conclusion SSB allowed high‐resolution motion‐corrected MR imaging, even when acquiring multiple gradient echo signals or large acquisition matrices, without sacrificing accuracy of motion‐gating. SSB thus relieves restrictions on the choice of pulse sequence parameters, enabling the use of motion‐gated radial stack‐of‐stars MRI in a broader domain of clinical applications.

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{T}_{\mathrm{R}}

and reconstruction complexity.…”

Section: Discussionmentioning

confidence: 99%

Single‐spoke binning: Reducing motion artifacts in abdominal radial stack‐of‐stars imaging

Maatman

Ypma

Kachelrieß

et al. 2023

Magnetic Resonance in Med

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“…Multiphase acquisition sequences included axial stackof-the-star 3D Dixon T1-weighted GRE imaging (StarVIBE) with an axial slice thickness of 2.5 mm at precontrast, 0 sec (arterial phase), 49 sec (portal venous phase), 137 sec (equilibrium phase), and Coronal 3D T1-weighted Dixon GRE imaging at 98 sec after the beginning of contrast administration. 10,11,14 The detailed imaging protocol and parameters are summarized in Table S1 in the Supplemental Material. 0.1 mmol of gadobutrol (Gadovist, Bayer Schering Pharma AG., Leverkusen, Germany) per kilogram of body weight with a maximum dose not exceeding 7.5 mmol was administered manually at a rate of approximately 2 mL/sec followed by a saline flush.…”

Section: Mr Imagingmentioning

confidence: 99%

“…9 Recently, a radial stack-of-stars 3D Dixon gradient echo sequence (StarVIBE) has allowed for the acquisition of high-quality, free-breathing contrastenhanced MR images in pediatric patients, facilitating abdominal MR imaging of small infants with hepatoblastoma. 10,11 However, the small size of infants and children poses a major challenge to MRI spatial resolution. It can be difficult to distinguish between real invasion beyond anatomic landmarks and tumor displacement on MRI, just as it is on computed tomography (CT).…”

mentioning

confidence: 99%

Pediatric Hepatoblastoma After Neoadjuvant Chemotherapy: Diagnostic Performance of MR in Staging POSTTEXT and Vascular Involvement

Gong

Feng

Zhuang

et al. 2023

Magnetic Resonance Imaging

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BackgroundThe assessment of resectability after neoadjuvant chemotherapy of hepatoblastoma is dependent on Post‐Treatment EXTENT of Disease (POSTTEXT) staging and its annotation factors P (portal venous involvement) and V (hepatic venous/inferior vena cava [IVC] involvement), but MR performance in assessing them remains unclear.PurposeTo assess the diagnostic performance of contrast‐enhanced MR imaging for preoperative POSTTEXT staging and diagnosing vascular involvement in terms of annotation factors P and V in pediatric hepatoblastoma following neoadjuvant chemotherapy.Study TypeRetrospective.SubjectsThirty‐five consecutive patients (17 males, median age, 24 months; age range, 6–98 months) with proven hepatoblastoma underwent preoperative MR imaging following neoadjuvant chemotherapy.Field Strength/Sequence3.0 T; T2‐weighted imaging (T2WI), T2WI with fat suppression, diffusion weighted imaging, radial stack‐of‐the‐star/Cartesian 3D Dixon T1‐weighted gradient echo imaging.AssessmentThree radiologists independently assessed the POSTTEXT stages and annotation factors P and V based on the 2017 PRE/POSTTEXT system. The sensitivities and specificities were calculated for 1) diagnosing each POSTTEXT stage; 2) discrimination of stages III and IV (advanced) from those stages I and II (non‐advanced) hepatoblastomas; and 3) annotation factors P and V. The combination of pathologic findings and surgical records served as the reference standard.Statistical TestsSensitivity, specificity, Fleiss kappa test.ResultsThe sensitivity and specificity ranges for discriminating advanced from non‐advanced hepatoblastomas were 73.3%–80.0% and 80.0%–90.0%, respectively. For annotation factor P, they were 66.7%–100.0% and 90.6%, respectively. For factor V, they were 75.0% and 67.7%–83.9%, respectively. There was excellent, substantial, and moderate agreement on POSTTEXT staging (Fleiss kappa = 0.82), factors P (Fleiss kappa = 0.64), and factors V (Fleiss kappa = 0.60), respectively.Data ConclusionMR POSTTEXT provides reliable discrimination between advanced and non‐advanced tumors, and MR has moderate to excellent specificity at identifying portal venous and hepatic venous/IVC involvement.Evidence Level3Technical EfficacyStage 3

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“…2,9 Investigators have explored using prospective and retrospective free-breathing techniques to improve image subtraction in renal MRI; however, results remain preliminary and lack validation. 12,13 Dual-energy CT (DECT) is a technique that has several genitourinary applications, including evaluation of renal masses. Dual-energy CT has been shown to be as accurate as conventional CT for renal mass diagnosis, 14 with several additional potential advantages, including better correction of beam-hardening artifacts (which may mitigate pseudoenhancement in benign cysts 15 ), the ability to generate iodine image sets (which may improve visual detection of enhancement 16,17 ), and a hypothesized increased sensitivity to iodine (which may improve detection of enhancement in low-enhancing renal masses such as papillary RCC, compared with conventional CT 18 ).…”

mentioning

confidence: 99%

“…This is particularly important in masses, which show intrinsically increased SI on precontrast T1W images, a common finding in papillary RCC, where adequately registered subtraction images (contrast-enhanced T1W – precontrast T1W) are critical to detect enhancement 2,9 . Investigators have explored using prospective and retrospective free-breathing techniques to improve image subtraction in renal MRI; however, results remain preliminary and lack validation 12,13 …”

mentioning

confidence: 99%

Direct Comparison of Diagnostic Accuracy of Fast Kilovoltage Switching Dual-Energy Computed Tomography and Magnetic Resonance Imaging for Detection of Enhancement in Renal Masses

McGrath¹,

Ahmad²,

Sathiadoss³

et al. 2022

J Comput Assist Tomogr

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PurposeThe aim of the study was to compare diagnostic accuracy of dual-energy computed tomography (DECT) and magnetic resonance imaging (MRI) to detect enhancement in renal masses.MethodsAdults renal masses of 10 mm or greater with both fast kilovoltage potential switching DECT and contrast-enhanced MRI performed within 12 months were retrospectively included. Two blinded radiologists independently evaluated for enhancement subjectively (5-point Likert scales) and quantitatively (signal intensity ratio ≥15% for MRI, iodine concentration ≥1.2 or ≥2.0 mg/mL for DECT). Per-lesion diagnostic accuracy, with histologic reference standard for solid masses, was expressed as the area under the receiver operator curve (AUC) for each index test. Differences were evaluated for statistical significance using the DeLong test.ResultsWe included 24 patients with 41 masses: 17 solid renal masses and 24 Bosniak 1 or 2 cysts. There was no significant difference in diagnostic accuracy comparing subjective enhancement by MRI and using iodine overlay DECT for reader 1 (AUC 0.99 vs 0.99, P = 0.38) or reader 2 (AUC 1.00 vs 0.94, P = 0.12) Interobserver agreement was κ = 0.61 for DECT and κ = 0.71 for MRI. There was no significant difference either in accuracy between quantitative assessment using signal intensity ratio or iodine concentration for reader 1 (AUC 0.94 vs 0.94, P = 0.88) or reader 2 (AUC 0.97 vs 0.92, P = 0.16). False-negative results in both subjective and quantitative assessment were nearly exclusively seen in papillary renal cell carcinoma, occurring with both DECT and MRI.ConclusionsWe detected no significant differences in accuracy for detecting enhancement in renal masses comparing MRI and DECT. Our results require further investigation in larger sample sizes, but suggest that DECT may be comparable to MRI for detection of enhancement in renal masses.

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Free-breathing radial stack-of-stars three-dimensional Dixon gradient echo sequence in abdominal magnetic resonance imaging in sedated pediatric patients

Cited by 8 publications

References 32 publications

Single‐spoke binning: Reducing motion artifacts in abdominal radial stack‐of‐stars imaging

Single‐spoke binning: Reducing motion artifacts in abdominal radial stack‐of‐stars imaging

Pediatric Hepatoblastoma After Neoadjuvant Chemotherapy: Diagnostic Performance of MR in Staging POSTTEXT and Vascular Involvement

Direct Comparison of Diagnostic Accuracy of Fast Kilovoltage Switching Dual-Energy Computed Tomography and Magnetic Resonance Imaging for Detection of Enhancement in Renal Masses

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