Radiology References

Imaging atlases, normal values, and reporting templates.

302 references · Page 8 of 11

R

Normal Radiolunate Angle Size on Radiography
The normal radiolunate angle on lateral wrist radiography ranges from -15° to 15°, a key measurement for detecting carpal instability.
Normal Radioscaphoid Angle Size on Radiography
Normal radioscaphoid angle on lateral wrist radiography measures 30–60°, a key parameter for diagnosing carpal instability and scaphoid malalignment.
Normal Radioulnar Angle Size on Wrist Radiography
Normal radioulnar angle on PA wrist radiography measures 72–95°, a key parameter for assessing distal radius alignment and wrist biomechanics.
Normal Radius Angle Size on Wrist Radiography
Normal radius angle on lateral wrist radiography measures 79–94°, a key parameter for assessing distal radius alignment and fracture reduction.
Normal Radius Palmar Tilt Size on Radiography
Normal radius palmar tilt on lateral wrist radiograph measures 2–20°, a key parameter for assessing distal radius fracture alignment and reduction.
Normal Rectosigmoid Index Size on Barium Enema
Learn the normal rectosigmoid index on barium enema, its measurement technique, and clinical role in diagnosing Hirschsprung's disease.
Normal Renal Artery Velocity Size on Ultrasound
Normal peak systolic renal artery velocity on Doppler ultrasound is less than 200 cm/s, a key threshold for detecting renal artery stenosis.
Normal Renal Diameter Size by Age: Ultrasound & CT
Reference guide for normal average renal longitudinal diameter by age from newborn to 4 years on ultrasound and CT imaging.
Normal Renal Pelvis Size on Ultrasound and CT
Reference ranges for normal renal pelvis diameter on ultrasound and CT, with clinical thresholds for hydronephrosis and key measurement pearls.
Normal Renal Resistive Index Size on Ultrasound
Learn the normal renal resistive index on Doppler ultrasound, its clinical thresholds, and how values above 0.7 suggest obstruction or intrinsic disease.
Normal Retrosternal Space Size on Chest Radiography
Normal retrosternal space on lateral chest radiograph measures less than 2.5 cm; enlargement is a key indicator of pulmonary hyperinflation.
Normal Retrotracheal Space Diameter at C5 on Radiography
Normal retrotracheal space maximal diameter at C5 on lateral neck radiography ranges from 1.2–2.0 cm in pediatric patients aged 0–14 years.
Normal Right Descending Pulmonary Artery Size on Radiography
Normal right descending pulmonary artery diameter is less than 16 mm on posteroanterior chest radiography, a key threshold for detecting pulmonary hypertension.
Normal Right Interlobar Pulmonary Artery Size on Radiography
Reference values for the normal right interlobar pulmonary artery diameter on chest radiography in children aged 1–14 years, by age group.
Normal Right Main Bronchus Diameter on Radiography
The normal right main bronchus maximal diameter on posteroanterior radiography is less than 2.4 cm, a key threshold for detecting airway pathology.
Normal Right Paratracheal Stripe Width on Chest X-Ray
The normal right paratracheal stripe measures less than 4 mm on anteroposterior chest radiography; widening suggests mediastinal pathology.
Normal Right Paratracheal Stripe Width on Radiography
The normal right paratracheal stripe measures less than 4 mm on PA chest radiography; widening suggests mediastinal pathology requiring further evaluation.

S

Normal Scapholunate Angle Size on Radiography
The normal scapholunate angle on lateral wrist radiography measures 30–60°, a key parameter for diagnosing carpal instability and ligamentous injury.
Normal Scapholunate Distance Size on Radiography
Normal scapholunate distance on posteroanterior radiography measures less than 3 mm; values exceeding this threshold suggest ligamentous instability.
Normal Schmidt-Fischer Angle Size on X-ray, CT & MRI
Normal Schmidt-Fischer angle measures 124–127° at the odontoid, a key craniovertebral junction landmark assessed on radiography, CT, and MRI.
Normal Scrotal Wall Thickness on Ultrasound
Normal scrotal wall maximal thickness on ultrasound measures 2–8 mm, with thickening indicating edema, infection, or inflammatory pathology.
Normal Small Bowel Diameter Size on CT, MRI & X-Ray
Normal small bowel anteroposterior diameter is <3 cm in adults, with age-specific pediatric values from 13.9 mm at 6 months to ~24.9 mm at age 15.
Normal Small Bowel Wall Thickness on CT and Ultrasound
Normal small bowel wall thickness is less than 3 mm on CT and ultrasound; exceeding this threshold suggests inflammation, ischemia, or neoplasm.
Normal Spermatic Cord Vein Size on Ultrasound
Normal spermatic cord vein diameter is ≤2.2 mm on ultrasound; values above this threshold indicate varicocele graded mild, moderate, or severe.
Normal Spinal Canal Diameter Size on X-Ray, CT & MRI
Normal spinal canal diameter ranges 17–22 mm in the thoracic spine and 15–25 mm in the lumbosacral spine on radiography, CT, and MRI.
Normal Spinal Canal Size in Stenosis: CT, MRI & X-Ray
Reference thresholds for spinal canal stenosis on CT, MRI, and radiography, covering cervical, thoracic, and lumbosacral measurements for clinical practice.
Normal Spleen Diameter Size by Age: Ultrasound, MRI & CT
Reference guide for normal spleen diameter by age on ultrasound, MRI, and CT—from neonates through young adults, with clinical thresholds.
Normal Splenic Vein Diameter on Ultrasound and CT
Normal splenic vein diameter measures less than 10 mm on ultrasound and CT, with normal splenic vein length under 13 cm in adults.
Normal Stahl's Lunate Index Size on Radiography
Normal Stahl's lunate index ranges from 0.50–0.56 on posteroanterior and lateral radiographs, a key ratio for assessing lunate morphology.
Normal Stomach Wall Thickness on Ultrasound and CT
Normal stomach wall thickness measures less than 10 mm on CT and ultrasound; values above this threshold warrant further evaluation for pathology.