Hjalmer Danielson

IS
Big data and its relevance to medical imaging
"Big data" is a buzzword you'll be seeing a lot over the next few years as your corporate executive team and healthcare vendors incorporate it into their business development activities. Hjalmer Danielson from Ascendian Healthcare Consulting helps give some definition to the term in this new column.
November 7, 2013
2013 05 31 14 24 53 75 Ascendian Logo 200
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Ultrasound MinnieCast, Episode 17: Elastography holds promise toward expanded role
By Amerigo Allegretto
David Fetzer, MD, discusses current applications and issues in the world of elastography.
September 18, 2026
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Minibeam radiotherapy performs well in first clinical trial
By Will Morton
The technique delivers very high doses of radiation through closely spaced, extremely narrow beams.
September 17, 2026
Radiation oncology medical physicist Michael Grams, MD, holds a device called a tungsten collimator that divides a conventional radiation beam into submillimeter-wide beamlets.
USPSTF names radiologist to task force; ACR responds
By Amerigo Allegretto
Dennis Wulfeck, MD, has 33 years of experience in diagnostic imaging, and his appointment to the task force has the support of the ACR.
September 17, 2026
Capitol Hill Government 400
Individual specialization may drive IR procedure complexity
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Practice- and radiologist-level IR specializations showed associations with greater procedural complexity.
September 17, 2026
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AI boosts brain aneurysm detection on CT angiography
By Will Morton
AI preferentially detected smaller aneurysms (< 3 mm), while radiologists more often identified larger aneurysms (3 to 5 mm and > 5 mm).
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ASTRO issues first radiation therapy guideline for bladder cancer
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Bladder preservation should be presented as a curative treatment option alongside radical cystectomy.
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LLM on par with head-and-neck subspecialists in analyzing MRI reports
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GPT-5-Thinking yields similar diagnostic accuracy compared to subspecialists focusing on orbital and head-and-neck MRI.
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CCTA links neighborhood income to atherosclerosis
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The relationship between socioeconomic disparities and imaging-defined coronary atherosclerosis on CCTA has not been fully understood.
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Chest CT muscle attenuation predicts future bone density loss
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Muscle and bone loss commonly coexist with aging, but potential links between paraspinal muscle and thoracic vertebral bone mineral density loss remain poorly understood
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Study overview. (A) Volumetric segmentation of the paraspinal musculature was performed for 1,316 participants. (B) Manual segmentation was performed, the results were compared with the volumetric segmentation results, and the Dice score and the intersection over union were calculated. (C) The three-dimensional segmentations from T1 through T10 were individually extracted and combined into a single volume for analyses. (D) Muscle volume and median muscle attenuation were derived from the segmentation volumes. (E) Analyses were performed to assess the correlation of the paraspinal muscle attenuation and volume with the bone mineral density and the ability to predict vertebral fractures. NIFTI = Neuroimaging Informatics Technology Initiative, 3D = three-dimensional.
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The radioligand therapy delivers targeted radiation to GEP-NETs by binding to somatostatin receptors expressed on these tumors.
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Brains age faster among residents in disadvantaged neighborhoods
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MRI data show that living in disadvantaged neighborhoods is tied to adverse brain health.
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National and state neighborhood-level disadvantage rankings of the study patients. (A) National disadvantage rankings are shown. Left: area deprivation scores mapped onto the state of Wisconsin, where the study sample resides, with national ranking deciles shown. Blue indicates less disadvantaged neighborhoods, whereas red indicates more disadvantaged neighborhoods. Right: histogram quantifying the number of patients in each Area Deprivation Index (ADI) decile. (B) Same as A, but state ranking deciles are shown. The distributions of both the national and state-level ADI rankings of the patients were skewed toward less disadvantaged neighborhoods. Maps were obtained from reference 36.
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More than two-thirds of radiation oncologists responding to an ASTRO survey this spring reported declines of 10% or more.
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