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  1. Article ; Online: Radiology-Pathology Correlations of Intracranial Clots: Current Theories, Clinical Applications, and Future Directions.

    Benson, J C / Kallmes, D F / Larson, A S / Brinjikji, W

    AJNR. American journal of neuroradiology

    2021  Volume 42, Issue 9, Page(s) 1558–1565

    Abstract: In recent years, there has been substantial progression in the field of stroke clot/thrombus imaging. Thrombus imaging aims to deduce the histologic composition of the clot through evaluation of various imaging characteristics. If the histology of a ... ...

    Abstract In recent years, there has been substantial progression in the field of stroke clot/thrombus imaging. Thrombus imaging aims to deduce the histologic composition of the clot through evaluation of various imaging characteristics. If the histology of a thrombus can be reliably determined by noninvasive imaging methods, critical information may be extrapolated about its expected response to treatment and about the patient's clinical outcome. Crucially, as we move into an era of stroke therapy individualization, determination of the histologic composition of a clot may be able to guide precise and targeted therapeutic effort. Most radiologists, however, remain largely unfamiliar with the topic of clot imaging. This article will review the current literature regarding clot imaging, including its histologic backdrop, the correlation of images with cellular components and treatment responsiveness, and future expectations.
    MeSH term(s) Humans ; Intracranial Thrombosis/diagnostic imaging ; Radiography ; Radiology ; Stroke/diagnostic imaging ; Thrombosis/diagnostic imaging
    Language English
    Publishing date 2021-07-22
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Review
    ZDB-ID 603808-6
    ISSN 1936-959X ; 0195-6108
    ISSN (online) 1936-959X
    ISSN 0195-6108
    DOI 10.3174/ajnr.A7249
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Rabbit Elastase Aneurysm Model Mimics the Recurrence Rate of Human Intracranial Aneurysms following Platinum Coil Embolization.

    Ding, Y-H / Ghozy, S / Dai, D / Brinjikji, W / Kallmes, D F / Kadirvel, R

    AJNR. American journal of neuroradiology

    2022  Volume 43, Issue 5, Page(s) 741–747

    Abstract: Background and purpose: Intracranial aneurysms treated with coils have been associated with incomplete occlusion, particularly in large or wide-neck aneurysms. This study aimed to validate the accuracy of the rabbit elastase model in predicting aneurysm ...

    Abstract Background and purpose: Intracranial aneurysms treated with coils have been associated with incomplete occlusion, particularly in large or wide-neck aneurysms. This study aimed to validate the accuracy of the rabbit elastase model in predicting aneurysm recurrence in humans treated with platinum coils.
    Materials and methods: Elastase-induced saccular aneurysms were induced in rabbits and embolized with conventional platinum coils. The recurrence rates of aneurysms were retrospectively analyzed. Morphologic characteristics of aneurysms, angiographic outcomes, and histologic healing were evaluated.
    Results: A total of 28 (15.3%) of 183 aneurysms recurred. The aneurysm recurrence rate observed in this study (15.3%) is similar to those reported in multiple analyses of aneurysm recurrence rates in humans (7%-27%). The rate of recurrence was higher in aneurysms treated without balloon assistance (19/66, 28.8%) compared with those treated with balloon assistance (9/117, 7.7%). Aneurysms treated with balloon-assisted coiling had a lower recurrence rate (OR = 0.17; 95% CI, 0.05-0.47;
    Conclusions: The rabbit elastase aneurysm model may mimic aneurysm recurrence rates observed in humans after platinum coil embolization. Moreover, balloon assistance and high packing densities were significant predictors of aneurysm recurrence and occlusion.
    MeSH term(s) Animals ; Embolization, Therapeutic ; Humans ; Intracranial Aneurysm/chemically induced ; Intracranial Aneurysm/diagnostic imaging ; Intracranial Aneurysm/therapy ; Pancreatic Elastase ; Platinum/adverse effects ; Rabbits ; Recurrence ; Retrospective Studies ; Treatment Outcome
    Chemical Substances Platinum (49DFR088MY) ; Pancreatic Elastase (EC 3.4.21.36)
    Language English
    Publishing date 2022-04-28
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural
    ZDB-ID 603808-6
    ISSN 1936-959X ; 0195-6108
    ISSN (online) 1936-959X
    ISSN 0195-6108
    DOI 10.3174/ajnr.A7497
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Point: CFD--computational fluid dynamics or confounding factor dissemination.

    Kallmes, D F

    AJNR. American journal of neuroradiology

    2012  Volume 33, Issue 3, Page(s) 395–396

    MeSH term(s) Computer Simulation ; Diagnosis, Computer-Assisted/methods ; Humans ; Image Interpretation, Computer-Assisted/methods ; Intracranial Aneurysm/diagnosis ; Intracranial Aneurysm/physiopathology ; Models, Cardiovascular ; Rheology/methods
    Language English
    Publishing date 2012-01-19
    Publishing country United States
    Document type Editorial
    ZDB-ID 603808-6
    ISSN 1936-959X ; 0195-6108
    ISSN (online) 1936-959X
    ISSN 0195-6108
    DOI 10.3174/ajnr.A2993
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: TICI: if you are not confused, then you are not paying attention.

    Kallmes, D F

    AJNR. American journal of neuroradiology

    2012  Volume 33, Issue 5, Page(s) 975–976

    MeSH term(s) Brain Diseases/therapy ; Cerebral Revascularization/methods ; Humans ; Thrombolytic Therapy/methods
    Language English
    Publishing date 2012-01-12
    Publishing country United States
    Document type Journal Article ; Comment
    ZDB-ID 603808-6
    ISSN 1936-959X ; 0195-6108
    ISSN (online) 1936-959X
    ISSN 0195-6108
    DOI 10.3174/ajnr.A2905
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Identifying "truth" in computational fluid dynamics research.

    Kallmes, D F

    AJNR. American journal of neuroradiology

    2011  Volume 32, Issue 6, Page(s) E122; author reply E123

    MeSH term(s) Cerebral Angiography/methods ; Cerebrovascular Circulation ; Female ; Humans ; Intracranial Aneurysm/diagnostic imaging ; Intracranial Aneurysm/physiopathology ; Male ; Models, Cardiovascular ; Radiographic Image Interpretation, Computer-Assisted/methods ; Tomography, X-Ray Computed/methods
    Language English
    Publishing date 2011-04-14
    Publishing country United States
    Document type Letter ; Comment
    ZDB-ID 603808-6
    ISSN 1936-959X ; 0195-6108
    ISSN (online) 1936-959X
    ISSN 0195-6108
    DOI 10.3174/ajnr.A2537
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Augmented Reality.

    O'Reilly, M K / Heagerty, P J / Gold, L S / Kallmes, D F / Jarvik, J G

    AJNR. American journal of neuroradiology

    2020  Volume 41, Issue 8, Page(s) E67–E68

    MeSH term(s) Augmented Reality ; Spine
    Language English
    Publishing date 2020-07-16
    Publishing country United States
    Document type Letter ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't ; Comment
    ZDB-ID 603808-6
    ISSN 1936-959X ; 0195-6108
    ISSN (online) 1936-959X
    ISSN 0195-6108
    DOI 10.3174/ajnr.A6587
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Medical Imaging Compatibility of Magnesium- and Iron-Based Bioresorbable Flow Diverters.

    Oliver, A A / Koons, E K / Trester, P S / Kleinow, J E / Jonsgaard, R S / Vercnocke, A J / Bilgin, C / Kadirvel, R / Leng, S / Lu, A / Dragomir-Daescu, D / Kallmes, D F

    AJNR. American journal of neuroradiology

    2023  Volume 44, Issue 6, Page(s) 668–674

    Abstract: Background and purpose: Bioresorbable flow diverters are under development to mitigate complications associated with conventional flow-diverter technology. One proposed advantage is the ability to reduce metal-induced artifacts in follow-up medical ... ...

    Abstract Background and purpose: Bioresorbable flow diverters are under development to mitigate complications associated with conventional flow-diverter technology. One proposed advantage is the ability to reduce metal-induced artifacts in follow-up medical imaging. In the current work, the medical imaging compatibility of magnesium- and iron-based bioresorbable flow diverters is assessed relative to an FDA-approved control in phantom models.
    Materials and methods: Bioresorbable flow diverters, primarily composed of braided magnesium or antiferromagnetic iron alloy wires, were compared with an FDA-approved control flow diverter. The devices were assessed for MR imaging safety in terms of magnetically induced force and radiofrequency heating using 1.5T, 3T, and 7T field strength clinical scanners. The devices were deployed in phantom models, and metal-induced image artifacts were assessed in the 3 MR imaging scanners and a clinical CT scanner following clinical scan protocols; device visibility was assessed under fluoroscopy.
    Results: The magnesium-based bioresorbable flow diverter, iron-based bioresorbable flow diverter, and the control device all demonstrated MR imaging safety in terms of magnetically induced force and radiofrequency heating at all 3 field strengths. The bioresorbable flow diverters did not elicit excessive MR imaging artifacts at any field strength relative to the control. Furthermore, the bioresorbable flow diverters appeared to reduce blooming artifacts in CT relative to the control. The iron-based bioresorbable flow diverter and control device were visible under standard fluoroscopy.
    Conclusions: We have demonstrated the baseline medical imaging compatibility of magnesium and antiferromagnetic iron alloy bioresorbable flow diverters. Future work will evaluate the medical imaging characteristics of the bioresorbable flow diverters in large-animal models.
    MeSH term(s) Animals ; Intracranial Aneurysm/diagnostic imaging ; Magnesium ; Iron ; Absorbable Implants ; Radiography ; Alloys
    Chemical Substances Magnesium (I38ZP9992A) ; Iron (E1UOL152H7) ; Alloys
    Language English
    Publishing date 2023-05-11
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, N.I.H., Extramural
    ZDB-ID 603808-6
    ISSN 1936-959X ; 0195-6108
    ISSN (online) 1936-959X
    ISSN 0195-6108
    DOI 10.3174/ajnr.A7873
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Iatrogenic Foreign Materials Associated with Retrieved Clot Tissue via Mechanical Thrombectomy.

    Abbasi, M / Dai, D / Liu, Y / Fitzgerald, S / Kadirvel, R / Savastano, L E / Cloft, H / Kallmes, D F / Brinjikji, W

    AJNR. American journal of neuroradiology

    2021  Volume 42, Issue 7, Page(s) 1239–1249

    Abstract: Background and purpose: Hydrophilic polymers and polytetrafluoroethylene liners, commonly used in the construction of endovascular devices, occasionally separate from devices with subsequent embolization. We determined the frequency of such materials in ...

    Abstract Background and purpose: Hydrophilic polymers and polytetrafluoroethylene liners, commonly used in the construction of endovascular devices, occasionally separate from devices with subsequent embolization. We determined the frequency of such materials in thrombus specimens retrieved by mechanical thrombectomy in patients with stroke.
    Materials and methods: We retrospectively reviewed H&E-stained thrombus sections for presence and types of foreign materials. We identified 4 types of foreign materials-Type I: material was light green with refraction and had a homogeneous texture; type II: material was light gray and/or dark gray, thin, and loose or attenuated in texture; type III: material was light green with refraction, solitary in texture, irregular in shape, and was often associated with round or oval bubblelike particles and/or diffuse black particles; and type IV: material had homogeneous texture and was light pink or red. In addition, polymer materials from different layers of used mechanical thrombectomy catheters were compared with the foreign materials found in thrombus specimens.
    Results: A total of 101 thrombi were evaluated. Foreign materials were found in 53 (52.5%) thrombus samples. The most common type was type I (92%), followed by type II (30%). The histopathologic features of the polymer materials from mechanical thrombectomy catheters were similar to the foreign materials found in thrombus specimens. The inner polytetrafluoroethylene liner and coating layer of catheters resembled type I and type II of the foreign materials, respectively.
    Conclusions: Foreign polymer materials are present in approximately half of retrieved thrombi, most commonly polytetrafluoroethylene from catheter liners and less from hydrophilic coatings.
    MeSH term(s) Biocompatible Materials ; Foreign Bodies/pathology ; Humans ; Iatrogenic Disease ; Polymers ; Retrospective Studies ; Stroke/surgery ; Thrombectomy/instrumentation ; Thrombosis/pathology
    Chemical Substances Biocompatible Materials ; Polymers
    Language English
    Publishing date 2021-04-01
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural
    ZDB-ID 603808-6
    ISSN 1936-959X ; 0195-6108
    ISSN (online) 1936-959X
    ISSN 0195-6108
    DOI 10.3174/ajnr.A7106
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Prevalence of Intracranial Aneurysms in Patients with Connective Tissue Diseases: A Retrospective Study.

    Kim, S T / Brinjikji, W / Kallmes, D F

    AJNR. American journal of neuroradiology

    2016  Volume 37, Issue 8, Page(s) 1422–1426

    Abstract: Background and purpose: Few studies have examined the prevalence of intracranial aneurysms in connective tissue diseases such as Marfan syndrome, Ehlers-Danlos syndrome, neurofibromatosis type 1, and Loeys-Dietz syndrome. We studied the prevalence of ... ...

    Abstract Background and purpose: Few studies have examined the prevalence of intracranial aneurysms in connective tissue diseases such as Marfan syndrome, Ehlers-Danlos syndrome, neurofibromatosis type 1, and Loeys-Dietz syndrome. We studied the prevalence of intracranial aneurysms and other intracranial neurovascular pathologies such as arteriovenous malformations and intracranial dissections, in these 4 patient populations.
    Materials and methods: We retrospectively reviewed all patients who had a clinical diagnosis of Marfan syndrome, Ehlers-Danlos syndrome, neurofibromatosis type 1, or Loeys-Dietz syndrome who underwent MRA, CTA, and/or DSA imaging of the intracranial circulation between January 1, 2005, and January 31, 2015. The presence, location, and maximum dimensions of intracranial aneurysms were catalogued. Other neurovascular findings studied included intracranial dissections and arteriovenous fistulas and shunts. Baseline data collected included demographic characteristics (sex, age, smoking history), imaging modality, and cardiovascular comorbidities.
    Results: The prevalence of intracranial saccular and fusiform aneurysms was as follows: 14% (8/59) among patients with Marfan syndrome, 12% (12/99) among patients with Ehlers-Danlos syndrome, 11% (5/47) among patients with neurofibromatosis type 1, and 28% (7/25) among patients with Loeys-Dietz syndrome. Intracranial dissections were found in 2 patients (3%) with Marfan syndrome and 1 patient (1%) with Ehlers-Danlos syndrome. No intracranial dissections were found in patients with neurofibromatosis type 1 or Loeys-Dietz syndrome.
    Conclusions: Patients with connective tissue disorders, including Marfan syndrome, Ehlers-Danlos syndrome, neurofibromatosis type 1, and Loeys-Dietz syndrome, have a high prevalence of intracranial aneurysms.
    MeSH term(s) Connective Tissue Diseases/complications ; Female ; Humans ; Intracranial Aneurysm/epidemiology ; Intracranial Aneurysm/etiology ; Male ; Prevalence ; Retrospective Studies
    Keywords covid19
    Language English
    Publishing date 2016-03-18
    Publishing country United States
    Document type Journal Article
    ZDB-ID 603808-6
    ISSN 1936-959X ; 0195-6108
    ISSN (online) 1936-959X
    ISSN 0195-6108
    DOI 10.3174/ajnr.A4718
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Histologic and Biomolecular Similarities in Healing between Aneurysms and Cutaneous Skin Wounds.

    Ayers-Ringler, J R / Khashim, Z / Ding, Y-H / Kallmes, D F / Kadirvel, R

    AJNR. American journal of neuroradiology

    2019  Volume 40, Issue 6, Page(s) 1018–1021

    Abstract: The poorly understood mechanisms of aneurysm healing contribute substantially to the pressing medical problem of coiled aneurysm recanalization. Using an established saccular aneurysm model, we developed an animal model system in rabbits to study ... ...

    Abstract The poorly understood mechanisms of aneurysm healing contribute substantially to the pressing medical problem of coiled aneurysm recanalization. Using an established saccular aneurysm model, we developed an animal model system in rabbits to study aneurysm and skin wound healing concurrently in the same animal. We found treated aneurysm healing to be similar to skin wound healing both histologically and in biomarker gene and protein expression, but in a delayed fashion.
    MeSH term(s) Animals ; Disease Models, Animal ; Intracranial Aneurysm/pathology ; Rabbits ; Wound Healing/physiology
    Language English
    Publishing date 2019-04-25
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 603808-6
    ISSN 1936-959X ; 0195-6108
    ISSN (online) 1936-959X
    ISSN 0195-6108
    DOI 10.3174/ajnr.A6046
    Database MEDical Literature Analysis and Retrieval System OnLINE

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