There are multiple definitions:

1. American College of Radiology(English)

   • founded in 1923, the College is at the forefront of radiology evolution, representing nearly 40,000 radiologists, radiation oncologists, nuclear medicine physicians and medical physicists
   • DICOM, RRL
   • Radiology, Organizations (documentation)
   • https://www.acr.org/

2. American College of Rheumatology(English)

   • a professional membership organization committed to improving the care of patients with rheumatic disease and advancing the rheumatology subspecialty. Founded in 1934, we are a not-for-profit, global medical society that serves over 7,700 physicians, health professionals, and scientists worldwide
   • RA
   • Rheumatology, Organizations (documentation)
   • https://www.rheumatology.org/

3. albumin/creatinine ratio(English)

   • aka urine microalbumin; helps identify kidney disease that can occur as a complication of diabetes. Also associated with the risk of all-cause and CV death in a linear fashion without threshold effect
   • CPR, UAE, RLD, Tbil
   • Kidney and adrenals, Diabetes, Ratio-based metric, Cardiology
   • https://doi.org…9149(03)00736-7
   • https://doi.org…125-022-05661-1
   • https://doi.org…093/cvr/cvad083
   • https://doi.org…000000000001209

4. acute cellular rejection(English)

   • a common and serious complication of transplantation with substantial morbidity and mortality. A T-cell mediated inflammatory response characterized by macrophage and lymphocyte infiltrates, edema, and ultimately myocyte necrosis
   • AMR, ISHLT, CPI
   • Transplantation, Prognosis
   • https://doi.org…016/j.jcmg.2018
   • https://doi.org…LURE.121.008859
   • https://doi.org…1111/echo.14586

5. acceptor control ratio(English)

   • used to evaluate the coupling of respiration to phosphorylation, and defined as Vmax/V0 where Vmax is V(ADP, 1 mM)+V0
   • Mitochondrion, Ratio-based metric
   • https://doi.org…iol.2005.083030

6. area change ratio(English)

   • systolic to diastolic fractional alteration of luminal cross-sectional area of a blood vessel, or for a cardiac compartment where it can be calculated for three inlet, two apical, and two outflow tract segments of the (right) ventricle
   • VG, VGD, FAC, RVEDAI, RVEF, RVESAI, RVIT, STE, TAPSE
   • Vessel properties, Surgery, Ratio-based metric, Cardiology, Medical imaging, Echography/ultrasound, Artificial intelligence
   • https://doi.org…JAHA.120.016391
   • https://doi.org…574-025-00707-w

7. anterior corona radiata(Latin)

   • ALT, BLT, CC, DSI, DTI, FA, GFA, ISO, MMSE, mTBI, MSLT, NQA, QA, SLF, QSDR
   • Anatomy, Brain (dys)function
   • https://doi.org…neur.2017.00616

8. annual change rate(English)

   • AD, CSF, MCI, MMSE, OND, rS
   • Alzheimer's disease, Dementia
   • https://doi.org…JAD-2011-111349

9. anatomic complete revascularization(English)

   • associated with reduced death and myocardial infarction
   • FCR, MI
   • Anatomy, Cardiology, Surgery
   • https://doi.org…acc.2023.06.015

10. abnormal circadian rhythm(English)

    • is related to sleep apnea and the development of dilated cardiomyopathy in animal models
    • AF, AFM, ARNTL, AVSDP, CM, DAPI, DCM, DEG, KEGG, LVEDD, MACE, NCR, PCA, PLSDA, PVSDP, SA, SMC, UMAP
    • Cardiology, Circadian rhythm, Pathology
    • https://doi.org…093/cvr/cvae212
    • https://doi.org…0/ijms252313145

11. anterior column release(English)

    • a new surgical treatment option for adults with spinal deformity
    • Spine (or spinal cord), Surgery
    • https://doi.org…000000000000377