Body & Abdominal Imaging

Quantifies signal drop of an adrenal lesion from in-phase to opposed-phase gradient-echo MRI. Values above validated thresholds indicate intracellular lipid and support a lipid-rich adenoma.

Computes absolute and relative percentage washout of an adrenal nodule on multiphase CT. Adenomas typically enhance briskly and wash out rapidly, meeting the 60% absolute or 40% relative washout thresholds.

Names pancreatic and peripancreatic collections correctly per the Revised Atlanta Classification and scores radiologic severity of acute pancreatitis with the Modified CT Severity Index (Mortele).

Estimates total thyroid volume from three orthogonal measurements of each lobe using the standard ellipsoid formula or the Brunn (WHO) correction factor.

Scores a thyroid nodule from five ultrasound feature categories and maps the total to ACR TI-RADS levels TR1-TR5 with size-based FNA and follow-up recommendations.

Assigns colonic (C0-C4) and extracolonic (E0-E4) categories for CT colonography per the ACR C-RADS 2023 update, with the corresponding management recommendations.

Estimates urinary bladder volume from three orthogonal ultrasound dimensions using a shape-dependent correction coefficient, with an approximate error range from the original validation study.

Classifies cystic renal masses into Bosniak classes I through IV using the 2019 revised criteria for CT and MRI, and identifies lesions to which the system does not apply.

Estimates ovarian or testicular volume from three orthogonal measurements. The ovary uses the standard ellipsoid constant (0.523); the testis uses the Lambert constant (0.71), which best matches true volume by water displacement.

Assigns an ACR PI-RADS v2.1 assessment category (1-5) to a prostatic lesion on multiparametric MRI, using zone-specific dominant sequences: DWI for the peripheral zone and T2W for the transition zone, with DCE as a tie-breaker in the peripheral zone.

Estimates prostate volume from three orthogonal dimensions using the ellipsoid (or bullet) formula and computes PSA density (serum PSA divided by gland volume), a risk marker used when interpreting PSA and MRI findings.

Standardized anatomic complexity score (Kutikov & Uzzo 2009) for solid renal masses, summing radius, exophytic/endophytic growth, nearness to the collecting system, anterior/posterior location, and polar-line relationship, with an "h" suffix for hilar contact.

Risk-stratifies the probability of acute cholecystitis on gallbladder ultrasound using the data-derived algorithm of Patel et al. (2026): gallbladder distention, wall, contents, pericholecystic collections, hepatic artery PSV, sonographic Murphy sign, demographics and WBC are combined into practically excluded / reduced / elevated / substantially elevated risk, with approximate probability bands.

Categorizes liver observations in at-risk patients per ACR LI-RADS v2018: untreated observations are assigned LR-NC/1/2/3/4/5/M/TIV from major features (nonrim APHE, size, enhancing capsule, nonperipheral washout, threshold growth) with optional ancillary-feature adjustment; treated observations receive a treatment response (LR-TR) category.

Assesses diffuse hepatic steatosis: on non-contrast CT via absolute liver attenuation (<40 HU) and spleen-minus-liver difference (>10 HU), on contrast CT via a >20 HU spleen-liver difference, and on chemical-shift MRI via signal dropout and estimated fat fraction from in-/out-of-phase liver (and spleen) signal.

Estimates liver volume from cross-sectional dimensions (0.31 x L x W x H on CT/MRI per Muggli et al.; three-measurement ultrasound formula of Childs et al.) and computes expected standard liver volume from body weight (Heinemann) and from BSA (Vauthey), useful before hepatectomy and for hepatomegaly assessment.

Computes the splenic index (L x W x thickness, normal ~120-480 cm3), ellipsoid splenic volume (0.524 x L x W x T), and a revised ultrasound volume averaging maximal and craniocaudal length; optional height-based upper normal limits contextualize splenomegaly.

Generic solid-organ volume from three orthogonal dimensions using the prolate ellipsoid formula (L x W x H x pi/6), applicable on CT, MRI or ultrasound to organs and focal masses such as kidneys, pancreas, lymph nodes and thyroid lobes.

Grades chronic liver disease severity from bilirubin, albumin, INR, ascites and encephalopathy into classes A (5-6), B (7-9) and C (10-15). The class feeds prognostic estimates and treatment algorithms such as BCLC and TACE selection.

Objective liver-function grading from serum albumin and total bilirubin alone. ALBI = 0.66 x log10(bilirubin in umol/L) - 0.085 x albumin (g/L), banded into grades 1-3 that stratify prognosis and therapy selection in HCC.

Estimates liver fibrosis risk from age, AST, ALT and platelet count. Originally derived in HIV/HCV coinfection and now the guideline first-line screen for advanced fibrosis in MASLD; both validated cutoff conventions are reported and labeled.

Simple fibrosis marker computed as (AST / AST upper limit of normal) x 100 / platelets. WHO-endorsed when elastography or biopsy is unavailable; labeled bands flag significant fibrosis (0.5/1.5) and cirrhosis (1.0/2.0).

Assigns Barcelona Clinic Liver Cancer stage 0/A/B/C/D from tumor burden, cancer-related performance status and liver function, and returns the evidence-based first-line treatment strategy of the 2022 update.

Five-tier MRI score (1-5) estimating the likelihood that an indeterminate solid renal mass is clear cell RCC, from T2 signal, corticomedullary enhancement, microscopic fat and ancillary features (DWI, segmental enhancement inversion, ADER).

Scores 5 admission and 6 forty-eight-hour clinical criteria in acute pancreatitis; a total of 3 or more predicts severe disease, with rising mortality bands at 3-5 and 6 or more criteria.

Combines the T2W structural category, DWI category, and DCE category (each 1–5) of a bladder tumor on mpMRI into the overall VI-RADS score, with the associated probability band for detrusor muscle invasion and staging guidance.

Applies the Society of Radiologists in Ultrasound 2022 consensus for incidentally detected gallbladder polyps: morphology first (extremely low, low, or indeterminate risk), then size, returning no-follow-up, surveillance ultrasound intervals, or surgical consultation.

Determines whether hepatocellular carcinoma burden meets the classic Milan criteria and the more permissive UCSF expanded criteria for liver transplant candidacy, using tumor number, lesion diameters, and presence of macrovascular invasion or extrahepatic disease.

Single form that applies European EU-TIRADS, American Thyroid Association 2015 sonographic patterns, or Kwak TIRADS to the same ultrasound feature set and returns the risk category plus size-based FNA threshold for the selected system.

Calculates the Risk of Malignancy Index for an adnexal mass from ultrasound feature count (U), menopausal status (M), and serum CA-125, flagging scores above 200 as high risk warranting gynae-oncology referral.

Implements the IOTA ADNEX multinomial logistic model to estimate probabilities that an adnexal mass is benign, borderline, stage I primary invasive, stage II–IV primary invasive, or metastatic, using age, optional CA-125, and six ultrasound predictors.

Assigns AAST grade I–V for traumatic pancreatic injury based on contusion versus laceration, presence of duct injury, and whether the injury is distal, proximal (ampullary), or a massive head disruption.

Grades traumatic adrenal injury from cortical contusion (I) through deep medullary laceration and extensive parenchymal destruction to avulsion from the blood supply (V).

Grades bladder trauma from contusion or partial-thickness injury through sized extra- and intraperitoneal ruptures to injuries involving the trigone or bladder neck.

Selects AAST grade I–V for bowel wall and mesenteric trauma, from hematoma or partial-thickness injury without devascularization through full-thickness laceration, transection, and segmental devascularization.

Grades diaphragmatic injury from contusion through lacerations sized ≤2 cm, 2–10 cm, and >10 cm with limited tissue loss, up to large tissue loss >25 cm².

Grades duodenal trauma from intramural hematoma of a single portion through circumferential disruption, ampullary involvement, and massive pancreaticoduodenal destruction or devascularization.

Grades urethral trauma from contusion and stretch injury through partial and complete disruption, including complete transection with wide separation or extension into prostate or vagina.