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48 evidence-based tools — dose, contrast, oncology, neuro, cardiac & more
Rapid bedside estimate of intracerebral haemorrhage volume from three orthogonal CT measurements.
Percent internal carotid artery stenosis by the NASCET method used to guide carotid revascularisation.
Ratio of frontal horn width to maximal skull diameter, screening for ventriculomegaly and hydrocephalus.
CT-based grading of subarachnoid haemorrhage that stratifies the risk of symptomatic vasospasm.
Clinical grading of aneurysmal subarachnoid haemorrhage severity, correlating with surgical risk and mortality.
Alberta Stroke Program Early CT Score quantifying early ischaemic change in the MCA territory.
Grading of white-matter hyperintensities on MRI, reflecting the burden of small-vessel disease.
Grading of brain arteriovenous malformations to predict the risk of surgical resection.
Ratio of maximal cardiac width to maximal internal thoracic width on a frontal chest radiograph, screening for cardiomegaly.
Interpretation of the total Agatston coronary artery calcium score for cardiovascular risk stratification (MESA framework).
Ratio of main pulmonary artery diameter to ascending aorta diameter on CT, a non-invasive marker of pulmonary hypertension.
Right-to-left ventricular short-axis diameter ratio on CT pulmonary angiography, a marker of right-heart strain in acute pulmonary embolism.
Interpretation of ascending aortic diameter, with optional aortic size index (diameter indexed to body-surface area) to flag dilatation and surgical thresholds.
Left ventricular mass from M-mode/2D linear dimensions using the ASE-recommended cube (Devereux) formula, for detection of left ventricular hypertrophy.
Estimation of right atrial pressure from inferior vena cava diameter and its inspiratory collapse on echocardiography (ASE/Rudski criteria).
Approximate pleural effusion volume from the maximal pleural fluid separation measured on erect chest radiograph or thoracic ultrasound.
Characterises an indeterminate adrenal nodule as a lipid-poor adenoma using absolute and relative contrast washout on multiphase CT.
Estimates splenic volume from three orthogonal dimensions and flags splenomegaly.
General-purpose ellipsoid volume for any lesion or organ from three orthogonal dimensions.
Estimates hepatic fat using absolute liver attenuation and the liver–spleen difference on non-contrast CT.
Model for End-stage Liver Disease incorporating sodium, for chronic liver disease severity and transplant priority.
Non-invasive index estimating hepatic fibrosis from age, transaminases and platelet count.
Grades severity of chronic liver disease (cirrhosis) from bilirubin, albumin, INR, ascites and encephalopathy.
Estimates body surface area from height and weight using the Mosteller formula.
Classifies weight status from height and weight using WHO body mass index bands.
Estimates creatinine clearance for renal function assessment and contrast/renal drug dosing.
Semiquantitative grading of vertebral compression fracture from anterior, middle and posterior heights.
Grades scoliosis severity from the Cobb angle measured between the most tilted end vertebrae.
Assesses the tuber joint angle of the calcaneus on a lateral foot radiograph to detect depression of the posterior facet in calcaneal fractures.
Quantifies patellar height on a lateral knee radiograph by comparing patellar tendon length with patellar bone length, detecting patella alta or baja.
Estimates single-lobe and total thyroid volume from ultrasound lobe dimensions using the ellipsoid formula, to grade goitre and guide radioiodine or surgical planning.
Quantifies signal drop between in-phase and opposed-phase MRI to characterise a lipid-rich adrenal adenoma using the adrenal signal intensity index.
Calculates ovarian volume from three ultrasound diameters using the prolate-ellipsoid formula to distinguish a normal ovary from an enlarged or postmenopausal ovary.
Interprets transvaginal endometrial thickness against menopausal status and bleeding history to decide whether tissue sampling is warranted.
Applies mean sac diameter and serum β-hCG discriminatory thresholds to distinguish a normal early intrauterine pregnancy from a non-diagnostic scan or a failed / ectopic pregnancy.
Categorises amniotic fluid volume from the four-quadrant amniotic fluid index to identify oligohydramnios or polyhydramnios.
Interprets first-trimester nuchal translucency thickness and confirms measurement validity against the crown-rump length window.
Stratifies mid-trimester spontaneous preterm birth risk from transvaginal cervical length, accounting for singleton versus multiple gestation.
Screens for peripheral arterial disease by comparing the higher ankle systolic pressure with the higher brachial systolic pressure.
Estimates the clinical pretest probability of lower-limb deep vein thrombosis to guide D-dimer testing and compression ultrasound.
Grades internal carotid artery stenosis on Doppler ultrasound by combining ICA peak systolic velocity with the ICA/CCA velocity ratio (SRU consensus).
Estimates the clinical pretest probability of pulmonary embolism to guide use of D-dimer and CT pulmonary angiography.
Estimates the volume doubling time of a pulmonary nodule from two diameter measurements and the scan interval to help distinguish benign from malignant growth.
Normalises aortic diameter to body surface area to stratify the risk of rupture or dissection, complementing absolute diameter thresholds.
⚕️ All calculators are for educational and clinical decision support purposes.
Always verify calculations and apply clinical judgment.