Dr. Darrell Kirch

Nov 29, 2015

Acute pulmonary embolism (PE) with right ventricle (RV) enlargement and clot-in-transit. PE chest axial CT angiography images demonstrate pulmonary embolus in the right pulmonary artery (white solid arrow), an enlarged RV (dotted arrow), and thrombus transiting through the right atrium (black arrows), PE-RADS 4/RV+/T+. The “4” refers to the PE‑RADS ordinal category for the most proximal clot location (central arteries). “RV+” indicates RV enlargement (RV to left ventricle ratio ≥ 1.0). “T+” indicates definitive thrombus identified in the right atrium and/or RV.

ACR rolls out PE-RADS for pulmonary embolism care

July 21, 2026

Adobe Stock 517622853

CT reveals severe craniofacial, ocular trauma from pager blasts

July 20, 2026

F-18 PI-2620 average binding potential maps. Mean tracer binding (DVR) image from 165 older adults (A) and 13 young adults (B). Images are scaled from 1 to 1.8 for display purposes, but DVR values of less than 1 were frequently observed.

Tau PET tracer flags early Alzheimer risk in healthy older adults

July 17, 2026

Top eight incorrectly classified synthetic images (Most convincing fake images). Images A, B, C, D, E, F, G and H were the most infrequently correctly classified images at 24%, 43%, 59%, 64%, 69%, 71%, 71% and 73% respectively. All images are AI-generated. Images A, B and C are head CTs. Images D and E are chest CTs. Image F is a cardiac CT. Image G is a musculoskeletal MRI. Image H is a head MRI. Images are republished under a Creative Commons license (CC BY 4.0).

Radiologists can identify three out of four AI-generated images

July 17, 2026

ACR rolls out PE-RADS for pulmonary embolism care

By Amerigo Allegretto

The framework outlines grading and suggestions for CT and MRI angiography interpretation.

July 21, 2026

Acute pulmonary embolism (PE) with right ventricle (RV) enlargement and clot-in-transit. PE chest axial CT angiography images demonstrate pulmonary embolus in the right pulmonary artery (white solid arrow), an enlarged RV (dotted arrow), and thrombus transiting through the right atrium (black arrows), PE-RADS 4/RV+/T+. The “4” refers to the PE‑RADS ordinal category for the most proximal clot location (central arteries). “RV+” indicates RV enlargement (RV to left ventricle ratio ≥ 1.0). “T+” indicates definitive thrombus identified in the right atrium and/or RV.

CT reveals severe craniofacial, ocular trauma from pager blasts

Head injuries were nearly universal, affecting 93.2% of patients.

July 20, 2026

Adobe Stock 517622853

Tau PET tracer flags early Alzheimer risk in healthy older adults

Few studies have investigated how F-18 PI-2620 is associated with memory performance or AD-related biomarkers in cognitively unimpaired older adults.

July 17, 2026

F-18 PI-2620 average binding potential maps. Mean tracer binding (DVR) image from 165 older adults (A) and 13 young adults (B). Images are scaled from 1 to 1.8 for display purposes, but DVR values of less than 1 were frequently observed.

Radiologists can identify three out of four AI-generated images

By Amerigo Allegretto

Radiologists found it particularly difficult to distinguish between real and AI-generated CT and MR images.

July 17, 2026

Top eight incorrectly classified synthetic images (Most convincing fake images). Images A, B, C, D, E, F, G and H were the most infrequently correctly classified images at 24%, 43%, 59%, 64%, 69%, 71%, 71% and 73% respectively. All images are AI-generated. Images A, B and C are head CTs. Images D and E are chest CTs. Image F is a cardiac CT. Image G is a musculoskeletal MRI. Image H is a head MRI. Images are republished under a Creative Commons license (CC BY 4.0).

Women's Imaging MinnieCast, Episode 13: Partial breast irradiation in the spotlight

By Amerigo Allegretto

Two committee members for ASTRO's PBI guidelines share insights about this breast cancer treatment option.

July 17, 2026

Minnie Cast Thumbnail (15)

Radiology dominates thirty years of FDA AI device approvals

The total annual authorization volume increased from a mean of 1.8 per year between 1995 and 2014 to 264 per year between 2023 and 2025.

July 16, 2026

Annual and cumulative FDA authorizations of AI/ML-enabled medical devices, 1995–2025.

Petition seeks to increase number of attempts for taking ARRT exam

By Amerigo Allegretto

The petition has received over 10,000 signatures as of July 16.

July 16, 2026

Student Doctor Laptop Test 400 (1)

Societies applaud introduction of Patients First Act

By AuntMinnie.com staff writers

The bill includes provisions affecting imaging appropriate use criteria (AUC), the Medicare conversion factor, and the Quality Payment Program (QPP).

July 16, 2026

2027 MPFS proposed rule would lift radiology reimbursement

By AuntMinnie.com staff writers

If finalized, the proposed rule is expected to hike reimbursement by 2% for radiology, 2% for nuclear medicine, 3% for interventional radiology, and 3% for radiation oncology.

July 15, 2026

MRI could replace DRE for prostate cancer staging

By Amerigo Allegretto

MRI showed comparable performance to DRE in prostate cancer staging without compromising patient outcomes.

July 15, 2026

Prostate Cancer 400

Petition asks FDA to implement new OEM rule for MRI safety

Radiofrequency (RF)-induced burns prompt recommendations to MRI manufacturers.

July 14, 2026

Mri Scanner2 Social

Incorrect AI suggestions influence reader performance on mammography

By Amerigo Allegretto

The biggest impact on reader performance stemmed from false-negative AI suggestions.

July 14, 2026

A normal mammogram confirmed by three-year radiologic follow-up illustrates reader-marked regions of interest (ROIs) during (A) unaided (round 1) and (B) artificial intelligence (AI)–assisted (round 2) reading. Each colored dot represents an ROI for recall by a human reader. Readers could mark more than one ROI per case, represented by multiple dots of the same color. During AI-assisted reading, the AI system displayed three visible prompts: two with suspicion of malignancy scores of 35% (left mediolateral oblique [L MLO] and craniocaudal [L CC]) and one with a suspicion of malignancy score of 10% (right craniocaudal [R CC]), shown as polygonal overlays. Without AI, six of 10 readers (60%) marked a false-positive ROI. With AI assistance, this fell to two of 10 (20%). R MLO = right mediolateral oblique.

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