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CT ABDOMEN MULTI PHASE

Note: This RIS code will be used for multi-phase liver, pancreatic and general multiphase abdomen examinations. PLEASE CLEARLY NOTE YOUR CLINICAL QUESTION AND ANY DIFFERENTIAL DIAGNOSES IN YOUR REQUEST

INDICATIONS

INDICATIONS(1-5)

General Indications:

  • Mesenteric ischemia

  • unclear findings on other imaging studies

  • abdominal and pelvic trauma suspected haemorrhage/laceration

  • ischaemic bowel

  • pre and post-transplant evaluation

  • congenital abnormalities

  • abdominal interventions (e.g. CT-guided biopsy, drainage)

  • Gastrointestinal haemorrhage

  • Liver disease, chronic, history of HCC, post treatment imaging

  • Liver lesion

    • incidental finding on other imaging, chronic liver disease

    • indeterminate on other imaging, history of extrahepatic malignancy

    • incidental finding on other imaging, otherwise normal liver function

  • Pancreatic cyst or solid mass, follow up

 

Liver Multi-Phase Protocol Indications:

 

 

Pancreatic Multi-Phase Protocol Indications:

  • detection and characterisation of pancreatic tumours

    • arterial phase useful for hyper vascular lesions e.g. neuroendocrine tumours and vascular lesions

    • late arterial phase useful for assessing hypo enhancing lesions e.g. pancreatic ductal adenocarcinoma

    • portal venous phase useful in assessing hepatic metastases and venous flow thrombosis

  • detection of cystic pancreatic lesions

  • acute pancreatitis

  • chronic pancreatitis

 

Adrenal Protocol Indications:

  • Adrenal nodules such as adrenocortical adenoma , carcinoma and pheochromocytoma depending on density. 

  • Incidental adrenal lesions found on other imaging

  • Distinguish between lipid rich and lipid poor adrenal adenomas, adrenocortical carcinoma and phaeochromocytoma

Pathology Demonstrated

PATHOLOGY DEMONSTRATED(1-5)

  • abdominal tumours, metastasis and enlarged lymph nodes

  • abnormal abdominal fluid collections including haemorrhage

  • air collections outside the gastrointestinal tract

  • calcifications within the abdominal organs

  • bowel obstruction

  • mesenteric ischaemia

  • soft tissue oedema around the abdominal organs and in the mesentery

  • blunt and penetrating abdominal and pelvic injuries

multiphasic protocols:

  • arterial phase: hyper vascular tumours and arterial vascular lesions

  • venous phase: depiction of hepatic metastases, venous thrombosis etc

Patient Preparation

PATIENT PREPARATION

  • Patient able to lie still for ten minutes

  • Not claustrophobic (sedation may be given)

  • Cognitively capable of following basic instructions

  • Metal artefacts removed from the region of interest, including bra’s

  • No respiratory distress when lying supine

  • Not allergic to Iodine based Contrast

  • No known kidney disease (eGFR below 30 as per RANZCR), however, acute setting consultant may sign to continue with poor renal function

  • No hyperthyroidism, may induce thyroid storm

  • Patient to have 20G cannula in anterior cubital fossa.

  • Preferably patient fasted for 4 hours

 

NOTE: Oral contrast may be required for some pancreatic studies. Please check with the Medical Imaging team.

ANATOMY INCLUDED

ANATOMY INCLUDED
 

Will vary depending on region of interest and radiologist preference e.g. triple-phase liver (non-con liver only + Arterial liver + Portal venous whole abdomen) 

Therefore, it is important to clearly note in request your clinical question and differential diagnoses for an accurate protocol.

 

Example below is for a General Triple Phase Abdomen for a GI Bleed (Non-con Abdomen + Arterial Abdomen + Portal Venous Abdomen)

1. Non-Contrast Abdomen
Non-Contrast Abdomen (Axial)
Non-Contrast Abdomen (Coronal)
Non-Contrast Abdomen (Sagittal)
2. Arterial Abdomen
Arterial Abdomen (Axial)
Arterial Abdomen  (Coronal)
Arterial Abdomen (Sagittal)
3. Portal Venous Abdomen
Portal Venous Abdomen (Axial)
Portal Venous Abdomen (Coronal)
Portal Venous Abdomen (Sagittal)

REFERENCES

1. American College of Radiology (ACR). Appropriateness Criteria. [Internet]. 2022 [Updated 2021, cited 10 Aug 2022]. Available from https://www.acr.org/Clinical-Resources/ACR-Appropriateness-Criteria​

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2. ​Radiopaedia. CT Pancreas (Protocol). [Internet]. 2008 [updated 7 April 2022, cited 23 Aug 2022]. Available from https://radiopaedia.org/articles/ct-pancreas-protocol-1#:~:text=The%20CT%20pancreas%20protocol%20serves,CT%20chest%2Dabdomen%2Dpelvis.

 

3. Radiopaedia. CT Adrenals (Protocol). [Internet]. 2008 [updated 7 April 2022, cited 23 Aug 2022]. Available from https://radiopaedia.org/articles/ct-adrenals-protocol

 

4. Radiopaedia. CT Triple-Phase Liver (Protocol). [Internet]. 2008 [updated 7 April 2022, cited 23 Aug 2022]. Available from https://radiopaedia.org/articles/ct-triple-phase-liver-protocol?lang=us#:~:text=portal%20venous%20phases.-,Indications,hyperplasia%2C%20adenoma%2C%20and%20hemangioma

 

5. Radiopaedia. CT Abdomen-Pelvis (Protocol) [Internet]. 2008 [updated 7 April 2022, cited 23 Aug 2022]. Available from https://radiopaedia.org/articles/ct-abdomen-pelvis-protocol-1?lang=us

© 2022 By Nicholas Bosley, Hannah Christian, Jackson Monck

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