Sample photon-counting detector images of low- and high-energy bins of a 70-year-old woman (section thickness, 2 mm; increment, 2 mm; window center, 45.

Slides:



Advertisements
Similar presentations
Color pressure maps (mm Hg) in a healthy subject in the axial (A) and coronal (D) planes as well as for a patient (C and F) with a type IIa DAVF affecting.
Advertisements

Axial T1-weighted image after contrast administration (A) and a FLAIR image (B) demonstrating a left parietal subcortical DVA with deep venous drainage.
Axial source images of left severe ICA stenosis; small residual lumen with vessel wall plaque and thick calcification on the sides. Axial source images.
A 50-year-old man with MD. Axial thin-section CT image shows decreased distance between the vertical limb of the posterior semicircular canal and the posterior.
Case 1. Case 1. CT scans in an 8-year-old boy with an ectopic tooth in the left nasal cavity.A, Coronal scan obtained with a bone window setting of 600-HU.
A 20-year-old man with HD. A, Neutral axial gradient-echo image at the C5 level demonstrates subtle bilateral LOA along the lateral aspects of the lamina.
Axial MR images in a 51-year-old woman with parkinsonism.
Radiation neuropathy. Radiation neuropathy. A 69-year-old woman with a history of breast carcinoma and external beam radiation therapy 2 years before imaging.
Intraosseous temporal bone meningioma in a 45-year-old woman who presented with left-sided hearing loss and tinnitus. Intraosseous temporal bone meningioma.
Image shows appearance of septum within dural sinus in a 68-year-old woman with normal results of an MR imaging examination. Image shows appearance of.
A 42-old-woman with tingling and numbness in the ulnar side of the right hand. A 42-old-woman with tingling and numbness in the ulnar side of the right.
56-year-old woman with diffuse large B cell lymphoma
66-year-old woman with well-differentiated squamous cell carcinoma of lower gingiva.A, Axial T1-weighted MR image of metastatic submandibular node (arrow)
A, MIP of 3 mm thickness of the 1.5T scan.
Patient 2: CNS vasculitis in a 37-year-old woman with systemic lupus erythematosus. Patient 2: CNS vasculitis in a 37-year-old woman with systemic lupus.
Serial axial T2-weighted images (2000/110/2 at treatment, 3400/100/4 at 6 months and 4000/100/3 at 10 months and 36 months after treatment) in a 52-year-old.
Patient 3, a 72-year-old woman with histopathologically proved CAA and a large hyperacute right frontal intracerebral macrohemorrhage (thick arrows). Patient.
Diffusion-weighted (TR = 3900, TE = 94, B = 1000, number of gradient directions = 90) imaging (A) with corresponding apparent diffusion coefficient map.
Corticobasal degeneration (CBD), case 1.
Coronal (A, B) and sagittal (D) sections of MIP reformations of a MDCTA performed on a 4-row-detector system in a 54-year old woman (patient 10) with an.
42-year-old male patient with follow-up neck CT for lymphoma at 70 kVp (A) and corresponding previous CT at 120 kVp (B). 42-year-old male patient with.
A 54-year-old woman with leukemia, changes in consciousness, and ataxia. A 54-year-old woman with leukemia, changes in consciousness, and ataxia. FLAIR.
Axial CT images at the basal ganglia level show subarachnoid hemorrhage on the right and a chronic lacunar infarct on the left. Axial CT images at the.
Pictorial depiction of the phase-masking process.
A 50-year-old woman with fever and severe hypertension.
A, Plots showing the signal-intensity behavior as a function of flip angle for gray matter (GM) and white matter (WM) at field strengths 1.5T and 3T. A,
A, 55-year-old woman who underwent superficial parotidectomy 22 years before recurrence. A, 55-year-old woman who underwent superficial parotidectomy 22.
Image examples of the improved detection of mixed white matter-gray matter lesions on the DIR pulse sequence. Image examples of the improved detection.
A 15-month-old girl with a history of trauma and type 1 CPC
A 45-year-old woman with a history of alcohol abuse had changes in consciousness and ocular abnormalities.A, No signal intensity alterations are seen on.
Normal apical ligament (arrow) and normal anterior atlantoaxial ligament (arrowhead) in the diagram (A) and the midsagittal T2-weighted MR image (B) in.
Axial MR image (TR/TE, 10,002/142) obtained when the patient was aged 5 days shows extensive areas of abnormal signal intensity, which suggest edema involving.
Axial MR image (10,002/142) obtained when the patient was aged 12 days demonstrates ventricular size and sulcal prominence have increased since the study.
Term-born infant with a small dimple at the back and without neurologic symptoms. Term-born infant with a small dimple at the back and without neurologic.
Identifying IPH on CE-MRA mask images in a 72-year-old man with a right cerebral ischemic event. Identifying IPH on CE-MRA mask images in a 72-year-old.
Transverse FLAIR (bottom row) and DIR (top row) sections of the supratentorial brain. Transverse FLAIR (bottom row) and DIR (top row) sections of the supratentorial.
Axial CT image through L5/S1 (3-mm section, 100 KVp, 50 mA).
Ill-defined margins as a sign of malignancy.
Cystic changes within the endplates adjacent to the implants.
A, A 44-year-old woman with CP
Representative multislice MIP projections of EPVS in the subcortical brain structures and the basal ganglia of a control and a subject with aMCI. Representative.
A 61-year-old woman with a calcified cerebral embolus to the left posterior cerebral artery.A, Axial 2.5-mm image from noncontrast brain CT shows a calcified.
A 47-year-old woman with a history of alcohol abuse presented with ataxia, changes in consciousness, and ocular abnormalities. A 47-year-old woman with.
Axial images of a 45-year-old woman (A and C) from the STD group (DLP, 1100 mGy×cm) and a 37-year-old man (B and D) from the LD group (DLP, 713 mGy×cm)
A, Curved multiplanar reconstruction image obtained with a CT myelography shows the left hemicord with the small remnant of subarachnoid space running.
A 34-year-old woman with SLE with APS
Axial head CT image across the centrum semiovale before (baseline image) and after (enhanced image) processing with CIE, with equivalent ROIs used to measure.
MR images of the brain (axial sections, fluid-attenuated reversion recovery sequences) show the symmetric hyperintensities (arrows) involving the pyramidal.
Sample energy-integrating detector and photon-counting detector images of a 67-year-old man (section thickness, 2 mm; increment, 2 mm; window center, 45.
Radial noise-power spectrum (NPS) measured in an anthropomorphic head phantom for energy-integrating detector and photon-counting detector scans at 120.
Fourth ventricular CSF pulsation artifact in four subjects.
Coronal T2-weighted images showing the STN in a patient with advanced PD (spin-echo acquisition; TR/TE/NEX, 2200 ms/90 ms/2). Coronal T2-weighted images.
Axial T2-weighted image (A) demonstrates focal cortical dysplasia (arrow) centered in the left anterior temporal lobe in a right-handed patient. Axial.
The “white gray sign.” Axial high-resolution 3D inversion recovery fast-spoiled gradient-echo T1-weighted image demonstrates decreased gray-white contrast.
A, Axial T2-weighted image (3500/90/2) shows a well-defined deep right occipital white matter lesion (asterisk) and a subcortical linear hyperintensity.
Axial T2-weighted MR image shows normal flow void in the right internal jugular vein (arrows), whereas flow-related enhancement can be seen in the left.
X-linked congenital deafness.
A–C, Thin-section (1-mm) coronal and axial CT images of the skull base obtained with an edge-enhancing bone algorithm show enlargement (arrows) of the.
A 75-year-old woman with compression fractures at T12 and L1, which were treated with vertebroplasty. A 75-year-old woman with compression fractures at.
A, Axial T2-weighted image reveals thickening of the cortical gray matter at the medial aspect of both frontal lobes, compatible with bifrontal cortical.
Persistent diffusion abnormalities in the brain stem of patient 2.
Axial DWIs at the level of the corona radiata obtained at 2 different time points (A and B) show recurrent periventricular infarcts. Axial DWIs at the.
Axial CT at level of thyroid cartilage shown on soft tissue window (width, 340 HU; center, 43 HU) in panel A and narrow window (width, 1 HU; center, 130.
Patient sample 2. Patient sample 2. MR imaging of a 33-year-old woman (patient 9) with post-LP syndrome before (A and C) and on follow-up after successful.
Tilted head position for intracranial CT angiography in a patient who has undergone clipping of a single aneurysm. Tilted head position for intracranial.
Axial fluid-attenuated inversion recovery MR of same patient as in Fig 1 done 19 days later (patient remained hospitalized) now showing an isointense area.
Left, T1 spin-echo image at 1
Same section position with spin-echo T1-weighted sequences at 1
Corticobasal degeneration (CBD), case 3.
A 73-year-old woman with well-differentiated SCCA of the lacrimal sac and nasolacrimal duct. A 73-year-old woman with well-differentiated SCCA of the lacrimal.
Presentation transcript:

Sample photon-counting detector images of low- and high-energy bins of a 70-year-old woman (section thickness, 2 mm; increment, 2 mm; window center, 45 HU; window width, 80 HU). Sample photon-counting detector images of low- and high-energy bins of a 70-year-old woman (section thickness, 2 mm; increment, 2 mm; window center, 45 HU; window width, 80 HU). A, Axial PCD image reconstructed from all detected photons (22–120 keV) at the level of the basal ganglia. B, Axial PCD image reconstructed from a low-energy bin image (22–52 keV) at the same level as A. C, Axial PCD image reconstructed from the high-energy bin image (52–120 keV) at the same level as A. The image noise for both the low- and high-energy bins is higher than that of the PCD image reconstructed from all detected photons because each bin contains only a subset of all detected photons. The low-energy bins provide good gray matter–white matter differentiation but are susceptible to beam-hardening, best seen as an artifactual increase in attenuation of the cortical GM and the subarachnoid space (arrows in B). The high-energy photons are less susceptible to beam-hardening but have poorer GM–WM differentiation. The image reconstructed from all photons is a trade-off between the good GM–WM differentiation of the low-energy image and the lower beam-hardening artifacts of the high-energy images. A. Pourmorteza et al. AJNR Am J Neuroradiol 2017;38:2257-2263 ©2017 by American Society of Neuroradiology