Non Echo Planar Dwi

Dremmen MH, Hofman PA, Hof JR, Stokroos RJ, Postma AA (12) The diagnostic accuracy of non-echo-planar diffusion-weighted imaging in the detection of residual and/or recurrent cholesteatoma of the temporal bone.

Non echo planar dwi. Compared with the EP DWI sequence, the non-echo-planar diffusion weighted imaging (non-EPI) DW imaging sequence produces thinner slices and has a higher imaging matrix, and it tends to produce fewer magnetic susceptibility artifacts but requires longer imaging times (multi-shot non-echo-planar DWI sequences require approximately 8 min), and non-EPI has higher sensitivity for detecting cholesteatoma and a lower misdiagnosis rate 7, 10, 11, 12. Non‐echo‐planar imaging (EPI) MRI has been recently introduced to improve the detection of small‐sized cholesteatoma and decrease different artefacts occurring in the EPI‐diffusion‐weighted (DW) technique. AIM:To examine the novel use of non-echo-planar diffusion weighted MRI (DWI) in depicting activity and treatment response in active Grave's orbitopathy (GO) by assessing, with inter-observer agreement, for a correlation between its apparent diffusion coefficients (ADCs) and conventional Short tau Inversion Recovery (STIR) MRI signal-intensity ratios (SIRs).

Diffusion-weighted imaging (DWI) techniques have shown potential to differentiate between benign and malignant neoplasms. Two different DWI techniques are currently in use :. This study investigated the use of echo planar imaging (EPI) and half-Fourier.

A large prospective multicentre randomized controlled study could validate the findings and evaluate the cost-effectiveness of DWI as an alternative for second-look surgery (control arm) in managing cases of. RS-EPI, readout-segmented echo planar imaging. Diffusion-weighted magnetic resonance imaging (DWI or DW-MRI) is the use of specific MRI sequences as well as software that generates images from the resulting data that uses the diffusion of water molecules to generate contrast in MR images.

However, the diagnostic significance of using DWI under routine conditions remains unclear. Non-echo-planar diffusion-weighted imaging represents an alternative to resolve this problem, once this method is less subject to this type of artifact, besides offering images with higher spatial resolution and thinner slice thickness, allowing the detection. To describe the accuracy of non-echo-planar diffusion-weighted magnetic resonance imaging (DW MRI) in identifying middle ear cholesteatoma.A meta-analysis of the published literature.A systematic review of the literature was performed to identify studies in which patients suspected of having middle ear cholesteatoma underwent DW MRI scans prior.

Echo-planar imaging (EPI), was invented by Sir Peter Mansfield in 1977 (Mansfield, 1977) long time before major companies invested in the development of clinical magnetic resonance imaging (MRI), which started in honest in 19. This has the advantage of speed but suffers from susceptibility artifacts/distortions, low signal-to-noise, and spatial blurring. Two different DWI techniques are currently in use:.

However, many authors have favoured non‐echo‐planar DWI as it is less susceptible to the skull base distortion that can occur because of the presence of an air–bone interface. Postma BACKGROUND AND PURPOSE:. Non-echo-planar DWI MR imaging (including the HASTE sequence) has been shown to be highly sensitive and specific for large cholesteatomas.

Diffusion-weighted magnetic resonance imaging (DWI) is an alternative to second-look surgery for the detection of cholesteatoma. 21, 22 Previous studies have also demonstrated this finding using echo-planar-DWI, but to our knowledge, this is the first demonstrating a positive relationship, using non-EPI-DWI. To investigate the feasibility of using diffusion-weighted (DW) echo-planar imaging (EPI) for differentiating primary parotid gland tumors.

We evaluated the diagnostic accuracy, expressed as a positive predictive value, of MR imaging for the detection of residual and/or recurrent cholesteatoma in our hospital. Non–echo-planar imaging (non-EPI) diffusion-weighted imaging (DWI) is an accurate noninvasive imaging option that can be used in diagnosing primary cholesteatoma. The Diagnostic Accuracy of Non-Echo-Planar Diffusion-Weighted Imaging in the Detection of Residual and/or Recurrent Cholesteatoma of the Temporal Bone M.H.G.

Non-echo-planar DWI MR imaging (including the HASTE sequence) has been shown to be highly sensitive and specific for large cholesteatomas. Since 06, non echo planar imaging (EPI) Diffusion weighted imaging (DWI) Magnetic resonance imaging (MRI) (sequences has shown high accuracy to depict recurrent cholesteatoma. Between the specificity measurements.

Mas-Estelles F, Mateos-Fernandez M, Carrascosa-Bisquert B, et al. More recently the term has been expanded to include any rapid gradient-echo or spin-echo sequence in which k-space is traversed in one or a small number of excitations. To examine the novel use of non-echo-planar diffusion weighted MRI (DWI) in depicting activity and treatment response in active Grave's orbitopathy (GO) by assessing, with inter-observer agreement, for a correlation between its apparent diffusion coefficients (ADCs) and conventional Short tau Inversion Recovery (STIR) MRI signal-intensity ratios (SIRs).

In CWD cases, as there is an open mastoid cavity that can be directly examined through otomicroscopy, residual or recurrent disease can often be detected and managed with microsuction in the clinic. Two diffusion gradients are added either side of the 180º RF pulse. Abstract BACKGROUND AND PURPOSE:.

Non-echo-planar DW MRI is highly sensitive and specific in identifying middle ear cholesteatoma. Li PM , Linos E , Gurgel RK et al. Non-echo planar (non-EPI) and echo planar (EPI) DWI.

As originally defined, echo planar imaging referred to a sequence in which data from all of k-space for an entire 2D plane was collected following a single RF-excitation pulse. ( 13 ) Evaluating the utility of non echo-planar diffusion-weighted imaging in the preoperative evaluation of cholesteatoma:. Several studies have shown that the echo planar imaging (EPI) DWI sequence and post gadolinium MRI are less accurate than non-echo planar diffusion weighted MRI (non-EPI DWI), possibly due to the higher susceptibility of EPI for magnetic interface artifacts and the lower image quality of post gadolinium , , , , , , ,.

In this way, central k-space is. To qualitatively and quantitatively evaluate image quality and compare the diagnostic value of non-echo-planar diffusion-weighted imaging (DWI) based on turbo spin-echo (TSE) and echo-planar imaging (EPI), to distinguish rNPC from post-chemoradiation fibrosis. We prospectively assessed the diagnostic accuracy of MRI including delayed post.

Non-EPI DWI is a promising alternative to second-look surgery for the detection of residual and/or recurrent cholesteatoma. Conventional diffusion-weighted imaging (DWI) is typically performed using a single-shot echo-planar (ss-EPI) sequence. To evaluate non echo-planar diffusion weighted magnetic resonance imaging (non-EP DW MRI).

The non-echo planar diffusion-weighted MRI (non-EP DWI) sequence is efficient in identifying the restricted diffusion in the substance of cholesteatoma, and, thanks to its sensitivity and precision, has changed the way otolaryngologists manage chronic ear disease. Non-echo planar (non-EPI) and echo planar (EPI) DWI. Fifty consecutive patients with a suspected primary tumor of the parotid gland were examined with a DW EPI sequence (TR 1,500 msec, TE 77 msec, field of view 250 x 250 mm, pixel size 2.10 x 1.95 mm, section thickness 5 mm).

Diffusion-weighted imaging (DWI) provides surgeons with a superior imaging tool to more accurately diagnosis cholesteatoma which are to be treated using transcanal endoscopic ear surgery (TEES). EPI minimises the effect of patient motion as it is a very quick sequence. Non-echo-planar DWI is highly sensitive and specific in detecting cholesteatoma.

Both echo‐planar and non‐echo‐planar DWI techniques have been utilised in detecting cholesteatoma. The purposes of this study were to determine the feasibility of diffusion-weighted imaging (DWI) with a single-shot echo-planar sequence and parallel technique for depicting endometrial cancer and to examine the role of this technique in preoperative assessment. The purpose of this study was to determine the diagnostic accuracy of HASTE DWI for the detection of incipient cholesteatoma in high-risk retraction pockets.

One such non EPI DWI technique is PROPELLER DWI on page (multishot FSE Periodically Rotated Overlapping Parallel Lines with Enhanced Reconstruction), which acquires k-space data in a rotating way, or in blades. On the DWI images with b-value 1000 s/mm 2, a cholesteatoma becomes apparent as a hyperintense area. To examine the novel use of non-echo-planar diffusion weighted MRI (DWI) in depicting activity and treatment response in active Grave’s orbitopathy (GO) by assessing, with inter-observer agreement, for a correlation between its apparent diffusion coefficients (ADCs) and conventional Short tau Inversion Recovery (STIR) MRI signal-intensity ratios (SIRs).

1247 - 1250 6. In the modern lexicon these are termed single shot. Contemporary non-echo-planar diffusion-weighted imaging of middle ear cholesteatomas.

To assess the utility of DWI with echo-planar (EPI-DWI) and non-echo-planar (PROPELLER) sequences for the diagnosis of primary and recurrent cholesteatoma. Non-echo planar DWI for cholesteatoma diagnosis can be performed on 1.5T or 3T scanners indifferently. In the comparison of preoperative evaluation for cholesteatoma and intraoperative findings.

To date non-EPI is. Non-echo-planar diffusion weighted MRI (NEDWI) combined with T2 weighted imaging acquisition using HASTE (half-Fourier acquisition single-shot turbo spin-echo) has been shown to be more accurate in diagnosing cholesteatoma within the post-operative ear than the standard echo-planar diffusion weighted imaging (EPDWI) routinely used to identify acute stroke (7). The diagnostic accuracy of non-echo-planar diffusion-weighted imaging in the detection of residual and/or recurrent cholesteatoma of the temporal bone.

1197 - 1213 5. Non-EPI DWI is a promising alternative to second-look surgery for the. The standard examination is a T2-weighted series in the coronal and axial plane, followed by a non-echo planar DWI series (b-values 0, 1000).

High sensitivity and negative predictive value and relatively lower specificity and positive predictive value are achieved by a single non-echo planar DWI protocol. DW MRI may help to stratify patients into groups of who would benefit from early second-look surgery and those who could be closely observed. Non-echo planar DWI is currently the imaging modality of choice due to its high diagnostic performance in the detection of post-operative cholesteatoma 1-3.

Even in diagnostic testing with high sensitivity and specificity, false positives and false negatives occur. The signal intensity should be higher than visible on the DWI images with b-value 0 s/mm 2. The purpose of this study was to determine the diagnostic accuracy of HASTE DWI for the detection of incipient cholesteatoma in high-risk retraction pockets.

None of the non-operated RS-EPI positive mismatched lesions and only one of the non-operated mismatched non-EPI positive cases was clinically suspected to have cholesteatoma over 469 ± 162 days of follow-up. A prospective study of 33 ears, 21 with previous cholesteatoma surgery. Planar imaging (EPI) and non-EPI DWI sequences.1–3 The single shot EPI (SS-EPI) DWI sequence is a standard, fast and relatively insensitive to motion artefact technique, however, limited by a poorer resolution due to the single.

This is important as DWI images the very small motion of water molecules which will be masked by any macroscopic body motion. On the ADC map, a low signal should be visible in the same area, confirming the presence of diffusion restriction. If EPI sequences had a high rate of diffeomorphic atefacts whereas non EPI sequences using either HAlf-Fourier acquisition Single-shot Turbo spin-Echo (HASTE) or Fast.

This technique is also time saving in comparison to delayed post‐contrast imaging. It allows the mapping of the diffusion process of molecules, mainly water, in biological tissues, in vivo and non-invasively. Peter Mansfield received the Nobel Prize in 03 for his contribution in the development of MRI and EPI in particular.

A spin-echo sequence is typically used, specifically echo-planar imaging (EPI). Non-echo planar diffusion weighted MRI (NEDWI MRI) is accurate in detecting cholesteatoma in the post-operative ear but the effect on surgical decision-making in the setting of revision mastoid surgery using surgical histopathology as the gold standard has not been investigated. New non–echo-planar DWI sequences, such as periodically rotated overlapping parallel lines with enhanced reconstruction, are superior to conventional echo-planar DWI, since they minimize susceptibility artifacts at the skull base and increase sensitivity for detection of lesions as small as 2 mm.

Developed by renowned radiologists in each specialty, STATdx provides comprehensive decision support you can rely on - Pars Flaccida Cholesteatoma. All patients underwent non‐echo planar HASTE diffusion‐weighted imaging prior to being offered ‘second‐look’ surgery. Radiological findings were correlated with second‐look intra‐operative findings in 38 cases with regard to presence, location and maximum dimensions of cholesteatoma.