Volume sweep imaging and ultrasound

Project led for the WFPI by Savvas Andronikou, Dorothy Bulas & Ines Boechat

 

Project origins



WFPI is looking to become a pediatric partner for Imaging the World (ITW) which involves non-radiologists acquiring ultrasound images using anatomical landmarks on the skin and storing US sweeps as cine-loops in a standard format, to be read by radiologists at a distance (tele-reading). ITW has no pediatric protocols, so Drs. Dorothy Bulas & Brian Garra  (ITW technical co-founder) have prepared protocols for specific “management changing” conditions in resource-limited settings. They will include hydronephrosis, hydrocephalus and mediastinal lymphadenopathy (as a proxy for TB) volume sweep US protocols.

 

The end goal: use in rural clinics at the point of care (POC) for management changing decisions.

Roll out in South Africa

The TB volume sweep research protocols have received  approval and ethical clearance under the stewardship of Prof. Health Zar, Chief Paediatrician at Red Cross War Memorial Children's Hospital and Chair Professor of Pediatrics at the University of Cape Town. The project will roll out in the Red Cross War Memorial Children’s Hospital (image right), nested within a larger HIV-TB project.

A pilot study previously conducted in Johannesburg’s Chris Hani Baragwanath Hospital by Dr. Tsepo Moseme and Savvas Andronikou in 2013 has already shown that sonography of the mediastinum is a feasible, reliable, non-invasive method which is able to detect mediastinal lymphadenopathy in children with suspected primary pulmonary tuberculsos. As such it provides an alternative POC diagnostic test in the diagnosis of pediatric TB. This preliminary paper is accepted for publication in the Pediatric Radiology journal.

This WFPI TB volume sweep research project will determine quality of transferred information; compare volume sweep diagnosis against a gold standard US examination and compare the US detection of lymphadenopathy against plain radiography while taking other definitive diagnostic tests into account. There is also an associated TB MRI project run by Dr. Tanyia Pillay (SASPI) with Savvas Anrdonikou, which can serve as a gold standard for a proportion of the patients.

Patient enrolment:
Any child suspected of TB will receive all the standard diagnostic tests, followed by abdominal US performed by a trained sonographer. The patient will then receive  a mediastinal volume sweep, ITW-style, performed by a blinded non-radiologist healthcare  worker with no prior US experience, followed by a chest CXR, and in a subgroup, MRI of the chest.

Study objectives:

1.    To evaluate volume sweeps for quality (procedural and demonstration of anatomy) – sent by email to radiologists in USA and South Africa
2.    To compare to volume sweeps against gold standard US for detection of lymphadenopathy
3.    Compare gold standard mediastinal US against abdominal US, chest radiographs and MRI

Renal and head US projects can also be performed in South Africa or alternatively in the USA, Europe or elsewhere as they do not require TB patients.

Publications

Other project partners

The American College of Radiology has funded project travel USA - South Africa.

 

 

 

Preparatory steps taken

Protocols were tested in early December 2013 (Brian Garra, DB and Dr. Kara-Lee Pool, a UCLA resident). Dr. Pool travelled to South Africa in January 2014 to train a non-radiologist in the sweeps.

The gold standard radiologist has been identified: Dr. Sabine Belard, a PhD student in Cape Town with an accepted protocol and ethics approval for pediatric abdominal bedside ultrasound on HIV.

The research protocols and ethics amendments were coauthored by Drs. Kara-Lee Pool, Sabine Belard, Savvas Andronikou and Heather Zar, who represent the authors of the proposed research.

The Red Cross Hospital has purchased a high-resolution, small footprint, sector transducer of 7.5 MHz for the project.

 

Dr. Kara-Lee Pool (UCLA) offering volume sweep training to Ms. Washiefa Isaacs, a nurse at the Red Cross Memorial Children's Hospital, Cape Town, South Africa, in preparation for the TB research project, January 2014. Dr. Pool is also documenting how this research project is presented to parents/primary carers so as to obtain consent for their children's enrolment.